Remove LOCAL_SRC_FILES from RRO modules

If LOCAL_SRC_FILES is not empty then building rro package will fail.
Sometimes LOCAL_SRC_FILES will be not empty by mistake, so delete
LOCAL_SRC_FILES for all rro modules.

Bug: 136694299
Test: treehugger
Change-Id: I2555c97f4ae98f6949837a19b4db4877cb38b607
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
diff --git a/AccentColorShiftPetrolOverlay/Android.mk b/AccentColorShiftPetrolOverlay/Android.mk
index 7b75590..324aeb4 100644
--- a/AccentColorShiftPetrolOverlay/Android.mk
+++ b/AccentColorShiftPetrolOverlay/Android.mk
@@ -21,8 +21,6 @@
 
 LOCAL_PRODUCT_MODULE := true
 
-LOCAL_SRC_FILES := $(call all-subdir-java-files)
-
 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
 
 LOCAL_PACKAGE_NAME := AccentColorShiftPetrolOverlay
diff --git a/FontOpenSans/Android.mk b/FontOpenSans/Android.mk
index 64b0fa1..130e7f0 100644
--- a/FontOpenSans/Android.mk
+++ b/FontOpenSans/Android.mk
@@ -104,7 +104,6 @@
 LOCAL_RRO_THEME := FontOpenSans
 LOCAL_PRODUCT_MODULE := true
 
-LOCAL_SRC_FILES := $(call all-subdir-java-files)
 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
 
 LOCAL_PACKAGE_NAME := FontOpenSansOverlay