Update Default AudioControl AIDL HAL for version 2

- Add Gain Callback to notify unexpected gain changed from HAL
(as currently done for Audio Focus).

- Add dumpsys commands

Bug: 154906631
Test: build and run VTS tests

Signed-off-by: Francois Gaffie <francois.gaffie@renault.com>
Change-Id: I6be9620feb19d766d43be7199be2e9cd6d63c644
diff --git a/automotive/audiocontrol/aidl/default/audiocontrol-default.xml b/automotive/audiocontrol/aidl/default/audiocontrol-default.xml
index f95d05f..e82f6fa 100644
--- a/automotive/audiocontrol/aidl/default/audiocontrol-default.xml
+++ b/automotive/audiocontrol/aidl/default/audiocontrol-default.xml
@@ -1,4 +1,4 @@
-<manifest version="1.0" type="device">
+<manifest version="2.0" type="device">
     <hal format="aidl">
         <name>android.hardware.automotive.audiocontrol</name>
         <fqname>IAudioControl/default</fqname>