Update build.yml

Minor update to build yaml

.github/workflows/build.yml

@@ -46,18 +46,6 @@ jobs:
            export PATH=$(readlink -f ./gcc-*aarch64-none*/bin/):$PATH
            RPI=3 bash -ex build.sh
            cp ./src/kernel*.img ./kernels/
-    - name: Build for Raspberry Pi 2
-      run: |
-           set -ex
-           export PATH=$(readlink -f ./gcc-*arm-none*/bin/):$PATH
-           RPI=2 bash -ex build.sh
-           cp ./src/kernel*.img ./kernels/
-    - name: Build for Raspberry Pi 1
-      run: |
-           set -ex
-           export PATH=$(readlink -f ./gcc-*arm-none*/bin/):$PATH
-           RPI=1 bash -ex build.sh
-           cp ./src/kernel*.img ./kernels/
     - name: Get Raspberry Pi boot files
       run: |
            set -ex