Fix: JTAG timings

[dragonmux]

Detailed description

In this PR we address the JTAG timing issues that the earlier refactor in #1118 accidentally introduced. These timings issues impact the ability for the JTAG-PDI branch to function, and made the timings for ARM parts marginal. The timings issues occur while doing TMS sequences.

The following captures show the before-and-after of this timing fix:

Your checklist for this pull request

• I've read the Code of Conduct
• I've read the guidelines for contributing to this repository
• It builds for hardware native (make PROBE_HOST=native)
• It builds as BMDA (make PROBE_HOST=hosted)
• I've tested it to the best of my ability
• My commit messages provide a useful short description of what the commits do

Closing issues

[esden]

LGTM