msm8960: Remove redundant Krait optimizations

 * Seems like these are no longer present in MR2.
   Most likely covered by TARGET_CPU_VARIANT now.

Change-Id: I6ce922a43914414e6aa530e514100fcc3535ff54
Add HAVE_SAMSUNG_AUDIO flag to fix USB DOCK AUDIO on D2

Change-Id: Ie475547a390922886016b686b108c87c064531c3