Turn on 48kHz sampling rate in offload's AAC codec capability

Bug: 331941704
Flag: exempt, only turn on capability does not effect stack behavior
Test: m com.android.btservices
Test: atest VtsHalBluetoothAudioTargetTest
Change-Id: I36bf1e2183f237988cc77465a486e70b942409f5
diff --git a/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.cpp b/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.cpp
index c25b102..db2528e 100644
--- a/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.cpp
+++ b/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.cpp
@@ -61,7 +61,7 @@
 
 static const AacCapabilities kDefaultOffloadAacCapability = {
     .objectType = {AacObjectType::MPEG2_LC},
-    .sampleRateHz = {44100},
+    .sampleRateHz = {44100, 48000},
     .channelMode = {ChannelMode::STEREO},
     .variableBitRateSupported = true,
     .bitsPerSample = {16}};