Revert "Add CTS tests to enforce PUSH_BLANK_BUFFERS_ON_STOP"

This reverts commit 03fa14e458a9bb85c1d3e23103b761691cde86af.

Codec2 IGBP#dequeueBuffer is non-blocking and happens on the codec
process. IGBP#dequeueBuffer on framework side could fail if there is no
ready buffer. Polling and waiting from framework side is not suitable by
design. Resolve this issue afterwards and re-land the CTS.

Bug: 230835807
Bug: 210587592
Change-Id: I7f73d5a3c615265b9775c035cd1dca627ab239af
2 files changed