Skip setting up cache paths on system package.
Skip setting up cache paths on system package.

The system package doesn't have any real data directories, so we
shouldn't try setting any cache paths.

Bug: 26895494
Change-Id: Iafca72f51d77eac5f602d842369de74ae8669b02

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base