audioflinger: remove unecessary call to HAL

On a flush, OffloadThread resets its state about HAL being paused.
For the sake of consistency, it is now expected that after a flush
as HW is no longer paused, the resume call is unnecessary.

Change-Id: I47d8b685dd23427bb44e24593124b4e42e4a315e
libstagefright handle offloadd for Wav files

Change-Id: Ib8f03d974f51873258aeb56c39fcda0af80e6e59
AudioFlinger : Modify fluash handling for output path

Change-Id: I00b0a561347632a14cf4134d3bc9f97c4070cc7c