ci: update kernel path in build workflow

Update the path from "$CONFIG/kernel" to "$CONFIG/common/kernel" to reflect the new directory structure for kernel module files.

.github/workflows/build.yml

@@ -209,7 +209,7 @@ jobs:
             sed -i 's/pr_warn("%s: disagrees about version of symbol %s\\n"/pr_warn("%s: disagrees about version of symbol %s, but ignore...\\n"/' version.c
             sed -i '0,/bad_version:/{/bad_version:/,/return 0;/{s/return 0;/return 1;/}}' version.c
           else
-            cd "$CONFIG/kernel"
+            cd "$CONFIG/common/kernel"
             sed -i 's/pr_warn("%s: disagrees about version of symbol %s\\n"/pr_warn("%s: disagrees about version of symbol %s, but ignore...\\n"/' module.c
             sed -i '0,/bad_version:/{/bad_version:/,/return 0;/{s/return 0;/return 1;/}}' module.c
           fi