Make sure that Exchange2Google overrides Exchange

Bug: 6367253
Change-Id: I35c3870242964041448572a27565ab956c860a0b
diff --git a/Android.mk b/Android.mk
index 73e21a2..0a07ab3 100644
--- a/Android.mk
+++ b/Android.mk
@@ -48,6 +48,7 @@
 LOCAL_STATIC_JAVA_LIBRARIES += calendar-common
 
 LOCAL_PACKAGE_NAME := Exchange2
+LOCAL_OVERRIDES_PACKAGES := Exchange
 
 LOCAL_PROGUARD_FLAG_FILES := proguard.flags