vs985: select qcwcn mixer_paths.xml

Change-Id: I8037e39b1c5c51db8950200cbf57dc1e8f0a3df8
vs985: update fstab

* add recoveryonly to boot and recovery partitions
* update deprecated prefix on usb/externalsd
* set auto for usb/externalsd filesystem

Change-Id: I9dfca66f45b6c51f0c6c8d11ca812490457e42ec