Revert "stagefright: Cleanup ifdefs in pause code"

Breaks audio pause-resume on non-QCOM device. The code here goes
with QCOM-specific mPaused code in OMXCodec.cpp.

Also added one more ifdef to fix compile error.

This reverts commit f771dc65603c8d06865f08a1b88be60cb53e19dd.

Change-Id: I1ebf3d15cfb7bf5c92745e0ab88cffd7adf192a0