set usb oem functions to diag,serial_cdev,rmnet_gsi by default

Bug: 74603740
Test: Did a clean flash and checked to see if persist.vendor.usb.config
was set to diag,serial_cdev,rmnet_gsi.
Change-Id: Ie5e4a723b2fe810fd8e365bc768a25d96379f807
diff --git a/device.mk b/device.mk
index 73f5472..20d72ff 100755
--- a/device.mk
+++ b/device.mk
@@ -642,3 +642,8 @@
 PRODUCT_PROPERTY_OVERRIDES += \
     ro.camera.notify_nfc=1
 
+# default usb oem functions
+ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))
+  PRODUCT_PROPERTY_OVERRIDES += \
+      persist.vendor.usb.usbradio.config=diag
+endif