Explicitly add the theme manager's AID to fs config

SELinux failed to set the theme manager's context since the
app has a fixed non-user ID, and it didn't map to a pseudo-username.

Change-Id: I287dc0dd02abc164fe22e14c9f3f505c3dcb938d

Conflicts:
	include/private/android_filesystem_config.h
rootdir: import init.cfx.rc

Change-Id: I928dfbe2640b0b699c44f6a83df21c8ec90f3f7a

Conflicts:
	rootdir/init.rc