config: change RTC_AEC module to loadable module for multiple platforms

This patch modifies the configuration to change the Google Real Time
Communication Audio Processing (RTC_AEC) module from built-in to a
loadable module for the MTPM, LNL, and PTL platforms. This change allows
for more flexibility in managing the module and reduces the firmware
size.

Changes include:
- Changing CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING from 'y' to 'm' in
  the intel_adsp_ace15_mtpm.conf configuration file.
- Changing CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING from 'y' to 'm' in
  the intel_adsp_ace20_lnl.conf configuration file.
- Changing CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING from 'y' to 'm' in
  the intel_adsp_ace30_ptl.conf configuration file.
- Adding CONFIG_LLEXT, CONFIG_LLEXT_STORAGE_WRITABLE, and CONFIG_MODULES
  to the intel_adsp_ace30_ptl.conf configuration file to support loadable
  modules.

This change ensures that the RTC_AEC module can be dynamically loaded as
needed, providing greater flexibility and potentially improving system
performance.

Signed-off-by: Tomasz Leman <[email protected]>

app/boards/intel_adsp_ace15_mtpm.conf

@@ -30,7 +30,7 @@ CONFIG_SAMPLE_KEYPHRASE=y
 # SOF / audio modules / mocks
 # This mock is part of official sof-bin releases because the CI that
 # tests it can't use extra CONFIGs. See #9410, #8722 and #9386
-CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING=y
+CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING=m
 CONFIG_GOOGLE_RTC_AUDIO_PROCESSING_MOCK=y
 
 # SOF / infrastructure

app/boards/intel_adsp_ace20_lnl.conf

@@ -26,7 +26,7 @@ CONFIG_SAMPLE_KEYPHRASE=y
 # SOF / audio modules / mocks
 # This mock is part of official sof-bin releases because the CI that
 # tests it can't use extra CONFIGs. See #9410, #8722 and #9386
-CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING=y
+CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING=m
 CONFIG_GOOGLE_RTC_AUDIO_PROCESSING_MOCK=y
 
 # SOF / infrastructure

app/boards/intel_adsp_ace30_ptl.conf

@@ -29,7 +29,7 @@ CONFIG_PIPELINE_2_0=y
 # SOF / audio modules / mocks
 # This mock is part of official sof-bin releases because the CI that
 # tests it can't use extra CONFIGs. See #9410, #8722 and #9386
-CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING=y
+CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING=m
 CONFIG_GOOGLE_RTC_AUDIO_PROCESSING_MOCK=y
 
 # SOF / infrastructure