Refactor UX481FA ACPI

[Qonfused]

Current tasks:

• Screenpad Plus
  • Fix backlight control (see Screenpad Plus Backlight Control #6 (comment))
• Keyboard
  • Add missing ATKD functions
    - Backlight
    • Bind FN + Lock backlight to _QD5 EC event.
    • Add keyboard backlight control (bound to _Q32 or 'toggle screenpad' key).
    • Add Screenpad 5-mode backlight control (bound to _Q31 or 'switch displays' key).
  • Investigate custom keyboard scan map w/ PS2 button overrides
• Misc. Interface Devices (I2C: Trackpad, Touchscreen; PS2: Keyboard, Mouse Buttons)
  • Resolve Trackpad APIC/GPIO pinning issue (see Slave address not acknowledged in new ELAN devices VoodooI2C/VoodooI2C#171, Fix VoodooI2CHID issue w/ Touchscreen #12 (comment))

Housekeeping:

• ACPI
  • Preserve atomic ACPI file structure
    • Map SSDT-UX481FA.aml to essential SSDTs:
      • SSDT-AWAK.aml
      • SSDT-EC-USBX.aml
        • SSDT-EC
        • SSDT-USBX (handled by SSDT-USB)
      • SSDT-PLUG.aml (required for macOS <12.3)
      • SSDT-PNLF.aml
      • SSDT-GPIO.aml or SSDT-XOSI.aml
        • GPIO Device
        • Trackpad GPIO fix
    • Investigate ACPI imports (e.g. importing macOS overrides for WAK function)
  • Investigate any sound card IRQ conflicts (HPET).
  • Fix SSDT-DISABLE-GPU null check and dependency
• Kexts
  • Verify kext load order (w/ plugins)
  • Verify misc. kexts are still warranted:
    • CpuTscSync.kext — fixes kernel panics on wake
    • DiskArbitrationFixup.kext — userspace; hides unreadable disk message on boot
    • ECEnabler.kext — addresses EC read byte length
    • HibernationFixup.kext — resolves hibernation issues w/ RTC + NVRAM
• OpenCore
  • Add Wi-Fi + Bluetooth kexts for different macOS targets (Catalina, Big Sur)

[Qonfused]

Will defer users to use the USBToolbox method instead of relying on an ACPI patch for mapping USB personalities should this be similarly prone to change. Otherwise a note should be given somewhere to remove the respective SSDT sans any internal USB personalities w/ the appropriate instructions.

This may also require the following ACPI rename to avoid errors:

<dict>
  <key>Comment</key>
  <string>XHC: _UPC to XUPC</string>
  <key>Count</key>
  <integer>0</integer>
  <key>Enabled</key>
  <true/>
  <key>Find</key>
  <data>X1VQQw==</data>
  <key>Limit</key>
  <integer>0</integer>
  <key>Mask</key>
  <data></data>
  <key>OemTableId</key>
  <data>UHJvalNzZHQ=</data>
  <key>Replace</key>
  <data>WFVQQw==</data>
  <key>ReplaceMask</key>
  <data></data>
  <key>Skip</key>
  <integer>0</integer>
  <key>TableLength</key>
  <integer>6103</integer>
  <key>TableSignature</key>
  <data>U1NEVA==</data>
</dict>

USBX can be merged with the EC device as SSDT-EC/USBX for consistency with the Dortania OpenCore guide.

[Qonfused]

Removed all non-critical SSDTs (will need to test for UX581/UX582 in #7).
Regressions will need to be cleared before implementing further fixes.

[Maleficent-Magik]

Thank, I'll see when I work at night :) but it will save a few MICRO seconds in the MacOS boot since it doesn't have to check this... In that's great

(Micro seconds : in its pure state, it is really 0,00001 and still...)

[Qonfused]

Unclear what these ADB codes are (from SSDT-KBD):

"Custom PS2 Map", 
Package (0x06)
{
    Package (0x00){},
    "46=80",   // 0x006b, Scroll Lock
    "e045=80", // 0x0071, Pause
    "e037=64", // 0x0000, Print Screen
    "e052=67", // 0x0000, Insert
    "e05d=57"  // 0x0a00, App (context menu key)
},

[Qonfused]

Will revisit pending commits from @wern-apfel/Zenbook-UX481FA in a separate PR.

Remaining issues will have to be solved in separate PRs:

• Screenpad Plus
  • Resolve display EDID issue (see [Kernel/FB] ScreenPad display static on FB initialization #4 (comment))
  • Investigate LPC bus / eSPI interface (see [Kernel/FB] ScreenPad display static on FB initialization #4 (comment))
• Misc. Interface Devices (I2C: Trackpad, Touchscreen; PS2: Keyboard, Mouse Buttons)
  • Resolve Mouse button issue (see [VoodooI2CHID] Fixing Physical Buttons on Trackpad #8 (comment))
  • Resolve I2C intermittency issue (see ELAN1200 stops working after a period of use VoodooI2C/VoodooI2C#321)
• Peripherals
  • Investigate internal USB personalities (DCAM/DCAN, etc)
  • Resolve built-in microphone issue (requires AppleHDA patch)
  • Investigate built-in camera issue (potential device enable issue)

[Qonfused]

Still need to test on different macOS versions (Catalina, Big Sur, Monterey <12.3) before merge.