audio HAL wrapper: createAudioPatch handle reuse

Add workaround for missing patch handle in HIDL
interface createAudioPatch() method signature.
The legacy HAL implementation has the convention of releasing
previous audio patch when a valid patch handle is passed.
The framework relies on this optimization and does not release previous
patch explicitly when just updating the sinks of an existing patch.

Bug: 117744819
Test: repro steps in bug
Change-Id: I93e19e4b16b0beac31438cffd0553f5db3117a1e