gralloc: fix warnings

Fix LP64 pointer casting warnings, unused parameters, and
turn off missing initializer warnings.

Change-Id: Idb70f4534282fed64ae81cb1e154d3f5b93091b0
diff --git a/modules/gralloc/Android.mk b/modules/gralloc/Android.mk
index e1fd7d4..a4ffd20 100644
--- a/modules/gralloc/Android.mk
+++ b/modules/gralloc/Android.mk
@@ -26,8 +26,8 @@
 	gralloc.cpp 	\
 	framebuffer.cpp \
 	mapper.cpp
-	
+
 LOCAL_MODULE := gralloc.default
-LOCAL_CFLAGS:= -DLOG_TAG=\"gralloc\"
+LOCAL_CFLAGS:= -DLOG_TAG=\"gralloc\" -Wno-missing-field-initializers
 
 include $(BUILD_SHARED_LIBRARY)