intel: update driver date, finalize transcoder integration
Update driver_date to 2026-05-30 and complete Phase 2 transcoder
wiring into the modesetting path.
Driver now covers all 5 phases of the INTEL-DRIVER-MODERNIZATION-PLAN:
0: Display Foundation (9 modules)
1: DP/HDMI (DP AUX, DP link, HDMI, hotplug, combo PHY, D2D)
2: Gen12 Display (Gen12 regs, DBUF, transcoder)
3: Full KMS (cursor, VBT, watermarks)
4: Render Path (batch, fence, execlists)
Remaining: Mesa winsys + atomic modesetting (cross-cutting),
DBUF detailed programming, GuC firmware.
vasilito
8c2249a26b