msm8974: Multi-offload support, reenable gapless

 * Add support for quad-offload.
 * This allows for reliable gapless playback!

Change-Id: I0ed091f5083a9fdcabb70520aac3109f0774a913
msm8974: Remove custom bitwidth from audio devices

 * HAL will manage this automatically now.

Change-Id: I30ed1fe4d432b758e9a939f1768b200dd0d42764