O6R4: Add Bluetooth A/B firmware property

* set A firmware BCM.hcd as default selected fimrware

Bug: 229395317
Test: Manually
Change-Id: I61d7ef4d476af50fc104c1877060459d14523898
diff --git a/device-raven.mk b/device-raven.mk
index 81b31e5..cf27fc2 100644
--- a/device-raven.mk
+++ b/device-raven.mk
@@ -76,7 +76,8 @@
 
 # Bluetooth
 PRODUCT_PRODUCT_PROPERTIES += \
-    persist.bluetooth.a2dp_aac.vbr_supported=true
+    persist.bluetooth.a2dp_aac.vbr_supported=true \
+    persist.bluetooth.firmware.selection=BCM.hcd
 
 # Bluetooth Tx power caps for raven
 PRODUCT_COPY_FILES += \