sepolicy: Deduplicate the final policy union

 * In our current setup, if the product makefiles attempt to be tricky
   and re-read the BoardConfig (in order to get the SoC type), we end
   up with duplicates in this list. This causes the build to fail. Let's
   just tolerate it until a better solution is created to the board vs.
   product setup problem.

Change-Id: Ia6d16da4424b3e354cae3f78c3ee8a9ef565046c
1 file changed