drm fixes for 5.18-rc7 (part two)

fbdev:
- revert NULL deref fix that turned into a use-after-free
- prevent use-after-free in fbdev
- efifb/simplefb/vesafb: fix cleanup paths to avoid use-after-frees

dma-buf:
- fix panic in stats setup

vc4:
- fix hdmi build

nouveau:
- tegra iommu present fix
- fix leak in backlight name

vmwgfx:
- Black screen due to fences using FIFO checks on SVGA3
- Random black screens on boot due to uninitialized drm_mode_fb_cmd2
- Hangs on SVGA3 due to command buffers being used with gbobjects
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