TKey on qemu 9.*

[mchack-work]

Description

• Merge upstream.
• Update to qemu's new CPU register method.
• New HTIF console handling, optional HTIF console. Adapted from quite's commit on the tk1-on-v8.0.0 branch

Fixes #13

Type of change

Please tick any that are relevant to this PR and remove any that aren't.

• [x] Feature (non breaking change which adds functionality)

Submission checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my changes
• [x] My changes are well written and CI is passing
• [ ] I have squashed my work to relevant commits and rebased on main for linear history
• [x] I have added a "Co-authored-by: x" if several people contributed, either pair programming or by squashing commits from different authors.
• [ ] I have updated the documentation where relevant (readme, dev.tillitis.se etc.)
• [x] QEMU is updated to reflect changes. Hah! Yes.

[mchack-work]

All this works fine:

• Tested with tkey-sign.
• Tested attaching GDB.
• Tested HTIF console when using firmware without -DNOCONSOLE.