Hearing Aid Profile: set and get activeDevice

Add setActiveDevice() for Hearing Aid Profile in SettingsLib

Bug: 69623109
Test: robolectric test and manual test
Change-Id: I70eafe030747053876e2ab8a125d5dd01c5e0eb9
Merged-In: I70eafe030747053876e2ab8a125d5dd01c5e0eb9
(cherry picked from commit d7b359165968199e034bd46ca97526dbf719602d)
7 files changed