Linux 6.12-rc7

Linux 6.9

Tagging asahi-6.8.6-4

Changes:
- DP/HDMI audio and sio related fixes
- enabling HDMI audio on M1 Ultra Mac Studio
- enabling HDMI audio on M2 Ultra devices (after m1n1 support)
- "merged" DCP pull request fim AsahiLinux/linux

Tagging asahi-6.8.6-3

Tagging asahi-6.8.6-2

Tagging asahi-6.8.6-1

ng asahi-6.8.4-1

Tagging asahi-6.8-2

Tagging asahi-6.8-1

Tagging asahi-6.6-16