FPS of glxgear with fullscreen is too low on MTL platform

[AceLan Kao]

[Impact]
Run `glxgears -fullscreen` and the FPS can't stay at 60 FPS
298 frames in 5.0 seconds = 59.465 FPS
241 frames in 5.0 seconds = 48.193 FPS
261 frames in 5.0 seconds = 52.030 FPS
268 frames in 5.0 seconds = 53.596 FPS

[Fix]
Bisect the kernel and found a commit in v6.9-rc1 fixes the issue
c08c364102d0 drm/i915: Bypass LMEMBAR/GTTMMADR for MTL stolen memory access

[Test]
1. Run `glxgears -fullscreen` on MTL platforms
2. The FPS should be always around 60

[Where problems could occur]
It's a workaround only affects MTL platforms, and there is no "fixed commit" for this patch after v6.9-rc1. So, it should be safe and essential for MTL platforms.