Update FreeRTOS/FreeRTOS build checks (#613)

This is needed to be compatible with the refactoring done in this
PR - https://github.com/FreeRTOS/FreeRTOS/pull/889

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

.github/workflows/kernel-checks.yml

@@ -45,28 +45,3 @@ jobs:
           cd inspect
           .github/scripts/kernel_checker.py --json ${HOME}/files_modified.json ${HOME}/files_added.json ${HOME}/files_renamed.json
           exit $?
-  build-checker:
-    name: FreeRTOS Posix Build Check
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout the parent repository
-        uses: actions/checkout@v2
-        with:
-          ref: main
-          repository: FreeRTOS/FreeRTOS
-          submodules: 'recursive'
-          fetch-depth: 1
-          path: ./workspace
-      - name: Checkout the current repository
-        uses: actions/checkout@v2
-        with:
-          path: ./workspace/FreeRTOS/Source
-      - name: Posix Build Checker
-        run: |
-              bash workspace/.github/scripts/posix_build_checker.sh workspace
-      - name: Install lib pcap dev
-        run: |
-          sudo apt-get install libpcap-dev
-      - name: Posix Network Build Checker
-        run: |
-          bash workspace/.github/scripts/posix_network_build_checker.sh workspace