Audio HAL V7.1: Add latency mode APIs

Add APis for controlling the latency mode on an output stream.
Latency mode control is optional but mandated if spatial audio with
head tracking is supported over Bluetooth classic audio link.

Bug: 187446271
Test: m android.hardware.audio@7.1-impl
Change-Id: I363db3bf7f7b6439e326d0f6f4becc10b3947e7d