ci: drop redundant Setup NoMount step (Integrate NoMount covers both modes)

.github/workflows/build.yml

@@ -197,12 +197,6 @@ jobs:
         os_patch_level: ${{ inputs.os_patch_level }}
         sublevel: ${{ steps.extract.outputs.sublevel }}
 
-    - name: Setup NoMount
-      if: contains(inputs.feature_set, 'NOMOUNT') || inputs.feature_set == 'FULL'
-      uses: ./.github/actions/nomount
-      with:
-        kernel_version: ${{ inputs.kernel_version }}
-
     - name: Baseband Guard
       if: (contains(inputs.feature_set, 'BBG') || inputs.feature_set == 'FULL')
       uses: ./.github/actions/bbg