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/api/current.txt b/audio/7.0/config/api/current.txt
index d4be9ae..b5b3925 100644
--- a/audio/7.0/config/api/current.txt
+++ b/audio/7.0/config/api/current.txt
@@ -46,6 +46,7 @@
     enum_constant public static final android.audio.policy.configuration.V7_0.AudioChannelMask AUDIO_CHANNEL_IN_VOICE_UPLINK_MONO;
     enum_constant public static final android.audio.policy.configuration.V7_0.AudioChannelMask AUDIO_CHANNEL_NONE;
     enum_constant public static final android.audio.policy.configuration.V7_0.AudioChannelMask AUDIO_CHANNEL_OUT_13POINT_360RA;
+    enum_constant public static final android.audio.policy.configuration.V7_0.AudioChannelMask AUDIO_CHANNEL_OUT_22POINT2;
     enum_constant public static final android.audio.policy.configuration.V7_0.AudioChannelMask AUDIO_CHANNEL_OUT_2POINT0POINT2;
     enum_constant public static final android.audio.policy.configuration.V7_0.AudioChannelMask AUDIO_CHANNEL_OUT_2POINT1;
     enum_constant public static final android.audio.policy.configuration.V7_0.AudioChannelMask AUDIO_CHANNEL_OUT_2POINT1POINT2;