audioflinger: OffloadThread fix for resume underrun

AudioFlinger can miss resuming h/w on a pause->resume transition
if sufficient data isn't available.

Change-Id: I3632b44571201bb47155f2ed3ad425fe68e04492
CRs-Fixed: 616599
libmedia: Set the correct audio latency in offload mode

- In offload mode latency is decided by Audio HAL.

Change-Id: I0f46ce9cb43e59907c07e77ec57fda47e841b094
CRs-Fixed: 609259
stagefright: Correct the updation of extension sample rate

For SBR content, the extension sample rate is being overwritten
with incorrect value when sample rate index is 0xf.
Fix the issue by correcting the logic to update the same.

Change-Id: I126e83665319b143fcfa52d1fb434ebbe453e6e1
CRs-Fixed: 636580