Track the move of split SELinux policy CIL files

The three CIL files comprising split sepolicy are being moved from the
root directory to system and vendor directories based on whether the
file is for platform/system policy or non-platform/vendor policy.

Test: Device boots, no additional SELinux denials. This test was run
      for a device which has split policy and for a device which has
      monolithic policy.
Bug: 31363362
Change-Id: Ica49f0beae56be0f1cea7117e48bf2f6af8b848b