Adding overrides support to android_app bps

Test: build
Change-Id: I7910d042c6e7f8ac9c77e294aca11b01713d0fef
diff --git a/core/soong_app_prebuilt.mk b/core/soong_app_prebuilt.mk
index ae0d196..fcd3baf 100644
--- a/core/soong_app_prebuilt.mk
+++ b/core/soong_app_prebuilt.mk
@@ -75,6 +75,8 @@
   PACKAGES.$(LOCAL_MODULE).PRIVATE_KEY := $(patsubst %.x509.pem,%.pk8,$(LOCAL_CERTIFICATE))
 endif
 
+PACKAGES.$(LOCAL_MODULE).OVERRIDES := $(strip $(LOCAL_OVERRIDES_PACKAGES))
+
 ifndef LOCAL_IS_HOST_MODULE
 ifeq ($(LOCAL_SDK_VERSION),system_current)
 my_link_type := java:system