Initialize the appcompat system property folder

Certain applications may have their system properties overlaid with the
contents overlaid for appcompat purposes. Init must initialize the
appcompat folder, same as it does the standard folder.

Bug: 291814949
Test: manual
Change-Id: I6d239e0a10a1c81a05d4121e5fc2c41da5b3dbc4
Merged-In: I0c6a0f66dc543c6e861bc86a417e4feb5ecd7789