Add LE audio hardware offload property

Add these property for the development on userdebug and eng only on P21.

Bug: 197296692
Test: verify media with HW and SW path pass
Change-Id: Id967269a555056e958c3f0b7b6d26c4b7ec81efc
diff --git a/device-raven.mk b/device-raven.mk
index 3d1aaa2..eaaa29b 100644
--- a/device-raven.mk
+++ b/device-raven.mk
@@ -246,3 +246,12 @@
 
 # This device is shipped with 31 (Android S)
 PRODUCT_SHIPPING_API_LEVEL := 31
+
+# userdebug specific
+ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))
+# Bluetooth LE Audio Hardware offload
+PRODUCT_PRODUCT_PROPERTIES += \
+    ro.bluetooth.leaudio_offload.supported=true \
+    persist.bluetooth.leaudio_offload.disabled=true \
+    persist.bluetooth.le_audio_test=true
+endif