Revert "Fix build"

Need to roll back original audio HAL change

This reverts commit 0ffa33d7080bebe5f02dee3c911a1767920e18e9.
diff --git a/hal/Android.mk b/hal/Android.mk
index ae1657f..ba59efc 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -50,11 +50,11 @@
 	platform_info.c \
 	audio_extn/ext_speaker.c \
 	audio_extn/audio_extn.c \
-	$(AUDIO_PLATFORM)/platform.c
+	$(AUDIO_PLATFORM)/platform.c \
 
 ifdef MULTIPLE_HW_VARIANTS_ENABLED
   LOCAL_CFLAGS += -DHW_VARIANTS_ENABLED
-  LOCAL_SRC_FILES +=  $(AUDIO_PLATFORM)/hw_info.c
+  LOCAL_SRC_FILES +=  $(AUDIO_PLATFORM)/hw_info.c \
 endif
 
 LOCAL_SHARED_LIBRARIES := \