libmediaplayerservice: fix warnings, make warnings errors, use clang

Change-Id: I1b2f6b65c5abbc366068a60b8909104f31b94228
diff --git a/media/libmediaplayerservice/Android.mk b/media/libmediaplayerservice/Android.mk
index 4b31715..2c4e719 100644
--- a/media/libmediaplayerservice/Android.mk
+++ b/media/libmediaplayerservice/Android.mk
@@ -54,6 +54,9 @@
     $(TOP)/frameworks/native/include/media/openmax                  \
     $(TOP)/external/tremolo/Tremolo                                 \
 
+LOCAL_CFLAGS += -Werror -Wall
+LOCAL_CLANG := true
+
 LOCAL_MODULE:= libmediaplayerservice
 
 LOCAL_32_BIT_ONLY := true