Tagging asahi-6.16.4-1

- rebase onto v6.16.4
- move boot fb removal closer to DCP drm device registering. Decreases
  time without drm KMS device significantly and hopefully very unlikely
  to start the display manager in that window
- fixes use-after-free in simplefb on M2* desktop devices (hello Debian)
- fix OOB read in nvmem core while reading atcphy efuses
- correct leftover t6000 references in t6020 DTs