ostest/wdog: Update wdog_test.

[Fix-Point]

Summary

This PR added periodic wdog testing and updated the wdog_test to adapt to the semantic changes of the wd_start.

Impact

This PR only affects the ostest/wdog_test.

Testing

Tested on QEMU/x86_64, sim and QEMU/riscv32.

[cederom]

Thank you @Fix-Point :-)

The changes are okay, but we have CI error, do we also need to update citest to match the wdog test in ostest update @lupyuen ? Lets verify that before merging please :-)

- generated json report: /github/workspace/sources/nuttx/boards/sim/sim/sim/configs/citest/logs/sim/sim/pytest.json -
=========================== short test summary info ============================
FAILED test_os/test_os.py::test_ostest - assert -2 == 0
FAILED test_os/test_os.py::test_mm - AttributeError: type object 'EOF' has no...
FAILED test_os/test_os.py::test_cxxtest - AttributeError: type object 'EOF' h...
FAILED test_os/test_os.py::test_scanftest - AttributeError: type object 'EOF'...
FAILED test_os/test_os.py::test_getprime - AttributeError: type object 'EOF' ...
FAILED test_os/test_os.py::test_stdio - AttributeError: type object 'EOF' has...
FAILED test_os/test_os.py::test_fs_test - AttributeError: type object 'EOF' h...
FAILED test_os/test_os.py::test_psram_test - AttributeError: type object 'EOF...
ERROR test_os/test_os.py::test_ostest - AttributeError: type object 'EOF' has...
ERROR test_os/test_os.py::test_mm - AttributeError: type object 'EOF' has no ...
ERROR test_os/test_os.py::test_cxxtest - AttributeError: type object 'EOF' ha...
ERROR test_os/test_os.py::test_scanftest - AttributeError: type object 'EOF' ...
ERROR test_os/test_os.py::test_getprime - AttributeError: type object 'EOF' h...
ERROR test_os/test_os.py::test_stdio - AttributeError: type object 'EOF' has ...
ERROR test_os/test_os.py::test_fs_test - AttributeError: type object 'EOF' ha...
ERROR test_os/test_os.py::test_psram_test - AttributeError: type object 'EOF'...
====== 8 failed, 1050 passed, 10 skipped, 8 errors in 2738.35s (0:45:38) =======
  [1/1] Normalize sim/citest
On branch master
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	boards/sim/sim/sim/configs/citest/logs/

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====================================================================================

[lupyuen]

@Fix-Point Can you check why sim:citest is failing at ostest wdog.c:365? Here's the CI Test Log:
https://gist.github.com/lupyuen/d942290f6fd6d2783aa47d243c9e3c3c

sudo docker run \
  -it \
  ghcr.io/apache/nuttx/apache-nuttx-ci-linux:latest \
  /bin/bash
cd
git clone https://github.com/apache/nuttx
git clone https://github.com/Fix-Point/nuttx-apps apps --branch fix-wdog-delay
pushd nuttx ; git reset --hard HEAD ; echo NuttX Source: https://github.com/apache/nuttx/tree/$(git rev-parse HEAD) ; popd
pushd apps  ; git reset --hard HEAD ; echo NuttX Apps: https://github.com/apache/nuttx-apps/tree/$(git rev-parse HEAD) ; popd
cd ~/nuttx/tools/ci
./cibuild.sh -c -A -N -R testlist/sim-01.dat
[ Wait for CI Test to fail, press Ctrl-C ]
ls -l ~/nuttx/boards/sim/sim/sim/configs/citest/logs/sim/sim
cat ~/nuttx/boards/sim/sim/sim/configs/citest/logs/sim/sim/*.log

Configuration/Tool: sim/citest
...
user_main: wdog test
wdog_test start...
wdtest_once 0 ns
...
wdtest_once 1000000 ns
dump_assert_info: Current Version: NuttX  12.9.0 e5bf4fc5c4 May 17 2025 00:34:19 sim
dump_assert_info: Assertion failed : at file: wdog.c:365 task: ostest process: ostest 0x400bc798