Simplify AudioTrack::restoreTrack_l()

Remove CBLK_RESTORING and CBLK_RESTORED from control block flags,
for AudioTrack only.  They are still used by AudioRecord.

This is part of a series to clean up the control block.

Change-Id: Iae4798f5b527c492bdaf789987ff3a1dadd0cb37
3 files changed