hammerhead: Enable new mixer for offload

Change-Id: I21620d3a2612c992dc70a783f20aa8b73e8c9073
hh: Tune interactive governor

 * Enable io_is_busy
 * Decrease hispeed_freq to avoid ramping voltage.
 * Match input_boost_freq to hispeed_freq for same reason
 * Lower sync_threshold to reduce jank from hotplug

 * No performance differences are apparent, and power draw should
   be lower in this configuration.

Change-Id: I68245da6008a76646e3936c8ce75806f1ffea0a4
hh: Enable qrngd

 * Improves boot time

Change-Id: I524d4fb248b0103543703eae923267b0c410b3ef
hh: Disable gapless by default

 * Audio driver will enable as necessary. Leaving it on always
   causes issues in some apps like Pandora.

Change-Id: I59a732577c3a4a61c8949498101b4b5bae0998ce