audio: Add AUDIO_CHANNEL_OUT_22POINT2 constant

24 channel configuration for immersive audio

See new value in system/media/audio/audio-hal-enums.h.
Define the same enum to HALv7 and update getChannelCount().

Test: atest android.hardware.audio.common@7.0-util_tests
Bug: 185530406
Change-Id: I8dc5e6c504049908fef157b11ffa043ecaeacaf9
diff --git a/audio/7.0/config/audio_policy_configuration.xsd b/audio/7.0/config/audio_policy_configuration.xsd
index 0753fea..4f5614b 100644
--- a/audio/7.0/config/audio_policy_configuration.xsd
+++ b/audio/7.0/config/audio_policy_configuration.xsd
@@ -505,6 +505,7 @@
             <xs:enumeration value="AUDIO_CHANNEL_OUT_7POINT1POINT2"/>
             <xs:enumeration value="AUDIO_CHANNEL_OUT_7POINT1POINT4"/>
             <xs:enumeration value="AUDIO_CHANNEL_OUT_13POINT_360RA"/>
+            <xs:enumeration value="AUDIO_CHANNEL_OUT_22POINT2"/>
             <xs:enumeration value="AUDIO_CHANNEL_OUT_MONO_HAPTIC_A"/>
             <xs:enumeration value="AUDIO_CHANNEL_OUT_STEREO_HAPTIC_A"/>
             <xs:enumeration value="AUDIO_CHANNEL_OUT_HAPTIC_AB"/>