Add Castor to udev rules

[agren]

Description

Castor has new USB VID and PID. This PR adds a new udev rule for it.

I've checked that the new udev rule works with a TKey built from main (tillitis/tillitis-key1@ea82b0c)

Related to PR tillitis/tkey-devtools#19

Type of change

• Feature (non breaking change which adds functionality)

Submission checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my changes
• I have tested and verified my changes on target
• My changes are well written and CI is passing
• I have squashed my work to relevant commits and rebased on main for linear history
• 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.)
• QEMU is updated to reflect changes

[mchack-work]

Tested on Arch by first removing all TKey related rules, then adding this rule to /etc/udev/rules.d, running tkey-runapp. Works fine on both Castor and Bellatrix.

Grumpy old man MC thinks it's a little unnerving that the device file's permissions stays the same, though, and all the special permissions for the uaccess tag et cetera are kept in the udev database. What's wrong with everything being a file? Plan 9 was right!