Add audio device type MULTICHANNEL_GROUP

Add audio device type MULTICHANNEL_GROUP for wireless speaker group
supporting multichannel content.

Flag: android.media.audio.enable_multichannel_group_device
Bug: 344031109
Test: atest CtsMediaAudioTestCases
Change-Id: I9a86bad61c350054fef883670c17509b07300ec8
diff --git a/media/audioaidlconversion/AidlConversionCppNdk.cpp b/media/audioaidlconversion/AidlConversionCppNdk.cpp
index cdcce08..1b506e9 100644
--- a/media/audioaidlconversion/AidlConversionCppNdk.cpp
+++ b/media/audioaidlconversion/AidlConversionCppNdk.cpp
@@ -480,6 +480,11 @@
                         AudioDeviceType::OUT_BROADCAST,
                         GET_DEVICE_DESC_CONNECTION(BT_LE))
             },
+            {
+                AUDIO_DEVICE_OUT_MULTICHANNEL_GROUP, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_MULTICHANNEL_GROUP,
+                        GET_DEVICE_DESC_CONNECTION(VIRTUAL))
+            },
             // AUDIO_DEVICE_IN_AMBIENT and IN_COMMUNICATION are removed since they were deprecated.
             {
                 AUDIO_DEVICE_IN_BUILTIN_MIC, make_AudioDeviceDescription(