configs: msm8998: Add support to handle USB OUT device without MIC

 -For voice call usecase if connected USB OUT device does not have a
mic, currently we fallback to Earpiece-Handset mic device pair.
-With tunnel mode USB support, we can instead use USB RX and
Handset Mic as a device pair for the voice call.
-Update mixer paths to use correct device based on if connected
USB device has input capability or not.

Change-Id: I01925a5f7238b5cd8e581d385a129fb96db76418