squisher-extras: remove more files

Change-Id: I87dfd5d8de408549f24881afeddbf80ac66ad864
move aapt config overrides after system includes

This needs to come after full_base is included.

Change-Id: If1a193d2e181ff77d90b5b7f948e5eb0d6760cf0
use caf audio variant

Who cares what it's called. This just means less patching outside
device tree. This is misleading because it would indicate we're
building something from hardware/qcom/audio-caf which isn't the
case. Audio HAL in device tree of course has always been CAF based.

Change-Id: I13f19ed3e34ef5e6c4ee5176bb2fc806b3f0cd29