airoha: Introduce 7581 SoC support

Introduce EN7581 SoC support with currently rfb board supported.

This is a new 64bit SoC from Airoha that is currently almost fully
supported upstream with only the DTS missing. Setting source-only
waiting for the full upstream support to be completed.

Signed-off-by: Christian Marangi <[email protected]>

Author: Ansuel

target/linux/airoha/Makefile

@@ -3,13 +3,11 @@ include $(TOPDIR)/rules.mk
 ARCH:=arm
 BOARD:=airoha
 BOARDNAME:=Airoha ARM
-CPU_TYPE:=cortex-a7
-FEATURES:=dt squashfs nand ramdisk gpio source-only
+SUBTARGETS:=en7523 an7581
+FEATURES:=dt squashfs nand ramdisk gpio
 
-KERNEL_PATCHVER:=5.15
+KERNEL_PATCHVER:=6.6
 
 include $(INCLUDE_DIR)/target.mk
 
-KERNELNAME:=Image dtbs
-
 $(eval $(call BuildTarget))