CI: Specify revision on BeagleConnect Freedom

BeagleConnect Freedom now defines multiple revisions in board.yml,
so specify the revision explicitly in CI.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: soburi

.github/workflows/build.yml

@@ -58,7 +58,7 @@ jobs:
 
       - name: Build adc
         run: |
-          west build -p -b beagleconnect_freedom/cc1352p7 $MODULE_PATH/samples/analog_input
+          west build -p -b beagleconnect_freedom@C7/cc1352p7 $MODULE_PATH/samples/analog_input
 
       - name: Archive firmware
         uses: actions/upload-artifact@v4