graphics/drm-*-kmod, graphics/nvidia-drm-*-kmod: Update DRM drivers
Several changes were made to all LTS drm-kmod branches:
- All branches were updated with Makefile cleanups and fixes.
- The addition of the DMA_BUF_IOCTL_EXPORT_SYNC_FILE and DMA_BUF_IOCTL_IMPORT_SYNC_FILE ioctls was backported to the 6.1 and 6.6 branches.
- A couple fixes to amdgpu and i915 drivers were committed to the 6.12 branch.
The corresponding graphics/nvidia-drm-*-kmod ports were updated to
reference the latest graphics/drm-*-kmod ports.
Sponsored by: The FreeBSD Foundation
(cherry picked from commit e50c876e295af951485b605b8cb9bf567b6c23e1)