Add the CI-CD check for clang formatting the ARM_CRx_MPU port

Author: Skptak

.github/workflows/ci.yml

@@ -15,6 +15,15 @@ jobs:
         with:
           exclude-dirs: portable
 
+  port-formatting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Check Formatting of FreeRTOS-Kernel Files
+        uses: FreeRTOS/CI-CD-Github-Actions/clang-formatting@main
+        with:
+          path: portable/GCC/ARM_CRx_MPU
+
   spell-check:
       runs-on: ubuntu-latest
       steps: