RC: fix custom boot animation

The custom boot animation had a race condition that ended up
changing the path to always be the system boot animation. Using
a local version of the path and setting it during the pre-execute
stage solves the race.

Change-Id: I341a131d05a748dfdc1205e488ba19fcc8d1a46a
Merge remote-tracking branch 'upstream/jb-mr1' into jb-mr1