Remove hidden api dependency of FeatureFlagUtils

Created hearing aid specfic method isHearingAidSettingsEnabled(Context context) to replace isEnabled(Context context, String feature).

Bug: 145230944
Test: Manual
Change-Id: I5fd04c6251ca63eddaa3c71b3d2a69b4202a7952
Merged-In: I2077554cfc6d66e0a2d7682aee11dc9f4364b7d0
1 file changed