Add USB audio dynamic channel mask to Nexus 5
Add USB audio dynamic channel mask to Nexus 5

Change-Id: Ieb0a3c90b5b7f9a87d2107afadef307fb55715a8

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead