CI: check-config: update generic config whitelist

Author: opsiff

.github/workflows/generic_config_whitelist

@@ -14,4 +14,6 @@ CONFIG_SCHED_DEBUG
 # driver for EFI frame buffer
 CONFIG_FB_EFI
 # driver for CAN bus
-CONFIG_CAN
+CONFIG_CAN
+# driver for USB serial
+CONFIG_USB_SERIAL