Add missing dependencies of targets-files-package

And move simple cases of $(ACP) to cp. That does change OTA/bin/updater
from 0640 to 0700, but that's more consistent anyways.

Test: m -j target-files-package; ensure it's the same before/after.
Change-Id: I37b65eb9ddccd2f360aa007f929ece35c9e44f9b