Improve fw_update compatibility in advance of OpenBSD 7.1

Brian Conwayrequested to merge
bconway/update_fw_update_7_1_beta into master
  • The new shell-based fw_update requires dmesg.boot, whereas the previous Perl-based one would fall back to dmesg. Using the build system's dmesg.boot is okay because we only install specific firmwares or all of them.
  • Use correct device names.
  • Update README.md.
  • Version bump.

Closes #22 (closed).

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