fix raspi net driver

Author: weiger9573

.github/workflows/action.yml

@@ -131,6 +131,7 @@ jobs:
          - {RTT_BSP: "at32/at32f407-start", RTT_TOOL_CHAIN: "sourcery-arm"}
          - {RTT_BSP: "smartfusion2", RTT_TOOL_CHAIN: "sourcery-arm"}
          - {RTT_BSP: "raspberry-pico", RTT_TOOL_CHAIN: "sourcery-arm"}
+         - {RTT_BSP: "raspberry-pi/raspi4-32", RTT_TOOL_CHAIN: "sourcery-arm"}
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python