msm8974: Enable support for true 24-bit audio

Change-Id: I6ef4547f01d3fd2f3d1b9304fcdd1a4870f0c28f
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
msm8974-common: Separate handset-stereo-dmic-ef from dmic-ef

Change-Id: Ie281647ddc17c98a7f41715ad0f927aa0429413d
msm8974-common: Increase volume of handset-mic to match stereo level

* Addresses BACON-121

Change-Id: I60753c9ac1943a41ab9b19d87cb64aa11d8ea937