FP4: Switch to source built audio HAL

* Avoid unnecessary edits on HAL source for custom config filenames like on stock

Change-Id: I38c22ac31d49416890b7ae864b096e3ece77e866
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 0d6744e..281b462 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -41,8 +41,12 @@
 
 # Audio
 AUDIO_FEATURE_ENABLED_EXTENDED_COMPRESS_FORMAT := true
+AUDIO_FEATURE_ENABLED_GEF_SUPPORT := true
 AUDIO_FEATURE_ENABLED_INSTANCE_ID := true
+AUDIO_FEATURE_ENABLED_PROXY_DEVICE := true
 AUDIO_FEATURE_ENABLED_SSR := true
+BOARD_SUPPORTS_SOUND_TRIGGER := true
+BOARD_USES_ALSA_AUDIO := true
 
 # Bootloader
 TARGET_BOOTLOADER_BOARD_NAME := FP4