Add 2 new ways to check for Support for Hearing Aids Profile

The getProfileProxy will return false if Hearing Aids Profile is not
supported. Also the getSupportedProfiles will return the correct support
for Hearing Aids even when Bluetooth is disabled.

Test: Manual testing with configuration enabled and disabled.
Bug: 119617521
Change-Id: I146bd3bc36d4c474f7bca18a05b679fb8e70ca63