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
LOCAL_PRODUCT_MODULE flag was not supported until last week.
go/add-a-clean-spec
Test: builds
Bug: 118757933
Bug: 118757664
Change-Id: Iffcc735f8b204407b27f8f29a51b7286ec0eab69