Fix warnigns in frameworks/av/services/radio.

- Fixes a number of "suggest braces around initialization of subobject"
warnings. [-Wmissing-braces]
- Fixes assignment operation.

Bug: 27151636
Change-Id: Id468ff7be4914c04224fd4430ccd128e7f3a89c8
diff --git a/services/radio/Android.mk b/services/radio/Android.mk
index 9ee5666..6aae31d 100644
--- a/services/radio/Android.mk
+++ b/services/radio/Android.mk
@@ -31,6 +31,8 @@
     libradio \
     libradio_metadata
 
+LOCAL_CFLAGS += -Wall -Wextra -Werror
+
 LOCAL_MODULE:= libradioservice
 
 include $(BUILD_SHARED_LIBRARY)