audio: enable compilation of qahw_api on Android builds

-Fix compilation errors from qahw_api tests and enable
 compilation of qahw_api on Android builds.

Change-Id: Ifc05ea22f0fd9ac0e6f6e9b22a6c593841acc761
diff --git a/qahw_api/test/Android.mk b/qahw_api/test/Android.mk
index 1688069..6ee6f4b 100644
--- a/qahw_api/test/Android.mk
+++ b/qahw_api/test/Android.mk
@@ -3,7 +3,8 @@
 # audio_hal_playback_test
 # ==============================================================================
 include $(CLEAR_VARS)
-LOCAL_SRC_FILES := qahw_playback_test.c
+LOCAL_SRC_FILES := qahw_playback_test.c \
+                   qahw_effect_test.c
 LOCAL_MODULE := hal_play_test
 
 hal-play-inc     = $(TARGET_OUT_HEADERS)/mm-audio/qahw_api/inc