Allow vendor_init_actionable to persist.sys.usb.usbradio.config

persist.sys.usb.usbradio.config can be used as an action trigger in
vendor init scripts.

Bug: 75202311
Bug: 74266614
Test: succeeded building and tested on pixels
Change-Id: I123b5ebce4bbf33f41222c2e11137d52e38ff9f8
diff --git a/init/stable_properties.h b/init/stable_properties.h
index bd568f0..4d47434 100644
--- a/init/stable_properties.h
+++ b/init/stable_properties.h
@@ -34,6 +34,7 @@
     "init.svc.zygote",
     "persist.bluetooth.btsnoopenable",
     "persist.sys.crash_rcu",
+    "persist.sys.usb.usbradio.config",
     "persist.sys.zram_enabled",
     "ro.bootmode",
     "ro.build.type",