Handle $(LOCAL_PATH) in androidmk

The variables LOCAL_ADDITIONAL_CERTIFICATES. LOCAL_ASSET_DIR,
LOCAL_CERTIFICATE, LOCAL_JARJAR_RULES, LOCAL_PROGUARD_FLAG_FILES,
LOCAL_RESOURCE_DIR specify the paths relative to the top of the
source tree using $(LOCAL_PATH)/. Remove it when converting to
blueprint files and diagnose the cases when these paths do not start
with $(LOCAL_PATH).

Fixes: 122728056
Test: Internal tests
Change-Id: Id3fcacdd5445a97365c03e00656291bfe829c035