[MQ HAL] Add a method for supported vendor parameters

This is a reposne to an SDK API feedback at b/382041722:
"Should there be an API to query all available parameter names"

Test: mmm
Flag: android.media.tv.flags.media_quality_fw
Bug: 382041722
Change-Id: Ia3cd3ffe38289bcb3d2e2f05bde2de1a897c6d21