Integrate `getAudioInputControlPoints()` into SettingsLib

Add this API into VolumeControlProfile to get the AICS control points of
the remote device.

Flag: com.android.settingslib.flags.hearing_devices_ambient_volume_control
Bug: 357878944
Test: atest VolumeControlProfileTest
Change-Id: I0020c5babd5f176ad2f3db37e1237c5b8d3b5f32
2 files changed