CI: Disable parallel test in spectest for NuttX (#3780)

.github/workflows/spec_test_on_nuttx.yml

@@ -327,19 +327,6 @@ jobs:
         working-directory: apps/interpreters/wamr/wamr
 
       - name: Test
-        if: matrix.target_config.target != 'xtensa'
-        run: |
-          cd apps/interpreters/wamr/wamr/tests/wamr-test-suites
-          ./test_wamr.sh -s spec ${{ matrix.wamr_test_option.mode }} -m ${{ matrix.target_config.target }} -b -Q -P -F ${{ steps.build_firmware_path.outputs.firmware }} ${{ matrix.wamr_feature_option.mode}}
-
-      # for xtensa, for some reasons, when running the tests
-      # with test_wamr.sh -P, nuttx occasionally hangs after
-      # "total segments stored 6" on the CI.
-      # i (yamamoto) couldn't reproduce it locally (macOS) even
-      # with the identical flash image.
-      # for now, run the tests without -P.
-      - name: Test
-        if: matrix.target_config.target == 'xtensa'
         run: |
           cd apps/interpreters/wamr/wamr/tests/wamr-test-suites
           ./test_wamr.sh -s spec ${{ matrix.wamr_test_option.mode }} -m ${{ matrix.target_config.target }} -b -Q -F ${{ steps.build_firmware_path.outputs.firmware }} ${{ matrix.wamr_feature_option.mode}}