Audio V4: propagate metadata to the HAL

This is needed for the earring aid use case.

Bug: 38184704
Bug: 69623109
Test: check that the correct metadata are propagate to the HALs.
Change-Id: I285aac9fbb5431cc32c6fbccebdbff4914e6ab92
Signed-off-by: Kevin Rocard <krocard@google.com>