androidbp: Add LOCAL_MODULE_MAKEFILE

We're hardcoding LOCAL_PATH instead of using the my-dir macro.
LOCAL_MODULE_MAKEFILE is the other variable set up by this macro, used
to ensure that changes to the makefile rebuilds the objects defined in
the makefile.

Change-Id: I994b72ab9053d5a057eb3e35a8710038800432eb
1 file changed