audio policy: Fix for voice call audio loss

Audio Policy service filters out one of the create patch
commands when it finds two pending commands with the same
patch handles. Due to this routing command is not received
to audio HAL and the voice call set up fails.
Fix this by filtering create patch commands only when
they are issued on the same output.

authored-by: Karthik Reddy Katta <a_katta@codeaurora.org>

Bug: 17787282
Change-Id: If36f0ab71e9b72d6a8eb61d31f762bc5e1683b89