build: Add QCOM target-specific config

 * Needed to support global DirectTract config on legacy targets
 * Let's also eliminate some boilerplate

Change-Id: I736c10a5e7e1f3d1e0de9e60f29b60add276f151
merge cm

Change-Id: I6f801a3a988796823fec87c7b18bc4c31c9ec887