armv7m4: add stlink host reset

JIRA: CI-433

Description

Implemented soft reset for host environment to run test runner without using GPIO's.

Motivation and Context

Types of changes

[ ] Bug fix (non-breaking change which fixes an issue)
[X] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

How Has This Been Tested?

[X] Already covered by automatic testing.
[ ] New test added: (add PR link here).
[X] Tested by hand on: armv7m4-stm32l4x6-nucleo (On host env).

Checklist:

[ ] My change requires a change to the documentation.
[ ] I have updated the documentation accordingly.
[X] I have added tests to cover my changes.
[X] All new and existing linter checks and tests passed.
[X] My changes generate no new compilation warnings for any of the targets.

Special treatment

[X] This PR needs additional PRs to work (list the PRs, preferably in merge-order). https://github.com/phoenix-rtos/phoenix-rtos-tests/pull/336
[ ] I will merge this PR by myself when appropriate.

Unit Test Results

7 218 tests - 242 6 527 :white_check_mark: - 217 36m 43s :stopwatch: - 1m 57s 420 suites ± 0 686 :zzz: - 29 1 files ± 0 5 :x: + 4

For more details on these failures, see this check.

Results for commit fb0aa8f1. ± Comparison against base commit 04b1486b.

This pull request removes 246 and adds 4 tests. Note that renamed tests count towards both.

``` phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.data_in phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.data_in_big phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.data_inout phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.data_inout_big phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.data_out phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.data_out_big phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.in_val phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.invalid_req phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.no_data phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit.ioctl.not_valid_fd … ``` ``` phoenix-rtos-tests/ioctl/unit ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/ioctl/unit phoenix-rtos-tests/libc/misc ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/libc/misc phoenix-rtos-tests/libc/pthread ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/libc/pthread phoenix-rtos-tests/libc/scanf ‑ armv7m4-stm32l4x6-nucleo:phoenix-rtos-tests/libc/scanf ```

:recycle: This comment has been updated with latest results.

phoenix-rtos / phoenix-rtos-tests