audio: Fix framecount calculation in AudioFlinger

 -Sharedblock implementation expects the framecount to
  be round up to the next highest power of 2. This is
  not done in TrackBase for non-voip case which leads
  to shared block getting corrupted.
 -Fix is to round up the framecount in TrackBase for
  all the audio formats.

  CRs-Fixed:  571279, 573735

Change-Id: I0186bb0e04a080100b364aead447ff2fce495ca2