Revert "Build SystemUI and Keyguard with AAPT2"

Looks like SystemUI's manifest may be corrupt.

This reverts commit 91f576081fe67f2742980f75c17d11e36f7c60e1.

Bug:29939875
Change-Id: I06e5f3cbc4629a67d254a8fcfcb9749b317aef5f
5 files changed