Remove references to $(ACP)

Remove references to $(ACP)

We're changing the implementation of these macros to not use acp.
Instead of having to keep this in sync, move to using a standard
prebuilt module. The build system has been updated to explicitly add the
executable bit to prebuilt modules in the EXECUTABLES class.

Change-Id: I29cf4d48619e022b7da65ef2df05a92bed08a456