Let Messaging dex depend on proguard flag file

The dex file will have the proguard flag file as an input
after this change.

Bug: 27954979
Change-Id: Ib584a38a6e8c6b744d604392de955cc3e928a040

Android.mk

@@ -64,11 +64,11 @@ else
     LOCAL_REQUIRED_MODULES:= libframesequence libgiftranscode
 endif
 
-LOCAL_PROGUARD_FLAGS := -ignorewarnings -include build/core/proguard_basic_keeps.flags
+LOCAL_PROGUARD_FLAGS := -ignorewarnings
 
 LOCAL_PROGUARD_ENABLED := nosystem
 
-LOCAL_PROGUARD_FLAG_FILES := proguard.flags
+LOCAL_PROGUARD_FLAG_FILES := ../../../build/core/proguard_basic_keeps.flags proguard.flags
 ifeq (eng,$(TARGET_BUILD_VARIANT))
     LOCAL_PROGUARD_FLAG_FILES += proguard-test.flags
 else