remove linkermap in ci since it failed to install

.github/workflows/build_arm.yml

@@ -61,12 +61,6 @@ jobs:
     - name: Checkout common submodules in lib
       run: git submodule update --init lib/tinyusb lib/uf2
 
-    - name: Checkout linkermap
-      uses: actions/checkout@v3
-      with:
-         repository: hathach/linkermap
-         path: linkermap
-
     - name: Install ARM GCC
       uses: carlosperate/arm-none-eabi-gcc-action@v1
       with:
@@ -79,7 +73,6 @@ jobs:
         ENV_PORT=`dirname $ENV_PORT`
         echo ENV_PORT=$ENV_PORT >> $GITHUB_ENV
         echo BIN_PATH=$ENV_PORT/_bin/${{ matrix.board }} >> $GITHUB_ENV
-        pip3 install linkermap/
 
     - name: Build
       run: |
@@ -88,9 +81,6 @@ jobs:
         make -C $ENV_PORT BOARD=${{ matrix.board }} all self-update copy-artifact
         for app in ${{ env.ENV_PORT }}/apps/*/; do if [ $app != 'apps/self_update/' ]; then make -C $app BOARD=${{ matrix.board }} all; fi done
 
-    - name: Linker Map
-      run: make -C $ENV_PORT BOARD=${{ matrix.board }} linkermap
-
     - uses: actions/upload-artifact@v3
       with:
         name: ${{ matrix.board }}