BT: add sysprop to enable OPUS codec

Add new system proprty persist.bluetooth.opus.enabled to
indicate devices enable OPUS codec.

Bug: 254609888
Test: atest net_test_stack:A2dpCodecConfigTest#init
Change-Id: I1df3d6de1b4c4020fb214b4a9fe2f4fe8b347195
diff --git a/device-raven.mk b/device-raven.mk
index 19e940b..e97a150 100644
--- a/device-raven.mk
+++ b/device-raven.mk
@@ -280,3 +280,7 @@
 # Enable adpf cpu hint session for SurfaceFlinger
 PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
     debug.sf.enable_adpf_cpu_hint=true
+
+# Bluetooth OPUS codec
+PRODUCT_PRODUCT_PROPERTIES += \
+    persist.bluetooth.opus.enabled=true