enable integer sanitizer for sdcard service

The previous false positive fix (df9c4a01) is enough to pass tests, and
it doesn't appear that there are any remaining issues.

Change-Id: Ib9812f1201ff0cd2ae8c8371737754fc328765b5
diff --git a/sdcard/Android.mk b/sdcard/Android.mk
index 2d04a7f..ac5faa7 100644
--- a/sdcard/Android.mk
+++ b/sdcard/Android.mk
@@ -7,4 +7,7 @@
 LOCAL_CFLAGS := -Wall -Wno-unused-parameter -Werror
 LOCAL_SHARED_LIBRARIES := liblog libcutils libpackagelistparser
 
+LOCAL_SANITIZE := integer
+LOCAL_CLANG := true
+
 include $(BUILD_EXECUTABLE)