audio flinger: rename Bluetooth latency mode APIs

Rename APIs controlling Bluetooth variable latency
after API review suggestions.

Bug: 257922898
Test: make

Merged-In: I517ad9c6aef14975c9e0a1a2703d1b17d638ea0e
Change-Id: I517ad9c6aef14975c9e0a1a2703d1b17d638ea0e
12 files changed