audio: Add volume/mute, audio mode, and screen state to IModule

Add the following methods to IModule:
 - getTelephony;
 - get/setMasterMute;
 - get/setMasterVolume;
 - get/setMicMute;
 - updateAudioMode;
 - updateScreenRotation;
 - updateScreenState;
The "update..." methods are "informational," the HAL may ignore
them and must not raise any errors.

ITelephony currently contains 2 methods:
 - getSupportedAudioModes;
 - switchAudioMode.
This "switchAudioMode" must validate the argument, and must
switch the HAL to the new mode synchronously.

Implement and add VTS tests.

Bug: 205884982
Test: atest VtsHalAudioCoreTargetTest
Change-Id: I9174c81fe7d16f7068257051ae5e129b15e82648