audio: enable audio using tinyalsa on MSM8974

Change-Id: I003dedd9f29de5aec1b620442aa8b3c3c7b7a816
diff --git a/hal/Android.mk b/hal/Android.mk
index 148e66c..79685e3 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -17,6 +17,10 @@
 	libaudioroute \
 	libdl
 
+ifeq ($(TARGET_BOARD_PLATFORM), msm8974)
+LOCAL_CFLAGS += -DMSM8974
+endif
+
 LOCAL_C_INCLUDES += \
 	external/tinyalsa/include \
 	$(call include-path-for, audio-route)