msm8974: Re-add separate FAST device path

 * It seems all we needed is to OR deep buffer into the primary path
   to catch the stragglers.
 * This improves path selection for FAST tracks since error cases can
   be avoided when non-standard sample rates are used.

Change-Id: I7e9cc5df946d0cbe7e36c3fe0768b5ec7e47ed19
Revert "msm8974: Re-add separate FAST device path"

 * This is still not where it needs to be.

This reverts commit aa58e73259e608ae0bde97f81559914f46780ddf.

Change-Id: I3f1fee643f2efef5493011e7cac7a33cf5f3af63