audio: Add pause support for hardware omx component

-ADSP doesn't enter sleep state after wma playback is paused
and power suspended.
-No support for NT session pause in case of hardware component.
NT session need to be paused to put ADSP into power collapse.
-Add support of pause in stagefright to ensure device enters
suspend mode. Also add intermediate states to avoid concurrency
issues between read and pause.

(cherry picked from commit f0a2da308d5e683ccde2d3d6f52c651bff6634e6)
(cherry picked from commit 27dc50267c424242930afe4740f2ddf5161d6d2c)
(cherry picked from commit 20e8fd2241be5dcf48a03a6f2a7927b6cd1ac15f)
(cherry picked from commit 2a15a4bf9754bda6e53530f65f82fa64b27f0f4f)

Change-Id: I41b946b8c8805e6ee303646b63513b5b16514ef6