audio: calculate the max buffer size runtime

  Currently kMaxBufferSize is predefined as 30720,
  but this is valid only for camcorder use-case and
  not for other use-case, but as this is predefined
  calculations for other than camera use-case go
  wrong, such as frameCount and record latency, which
  leads to issues such as data drop at the begining
  due to high record latency.

  So instead predefining the MaxBufferSize calculate
  it only for camcorder use-case and use standard AOSP
  value otherwise

Change-Id: Ie7d43ddfdcb2b13a8a5eaa12cc8a233ac0d9470d