6.12-stable patches

added patches:
	drm-nouveau-unsubscribe-the-channel-kill-event-before-the-fence-context.patch
	drm-nouveau-use-write-combined-maps-for-coherent.patch
	drm-nouveau-uvmm-clear-the-dirty-flag-when-unwinding-an-op_unmap_sparse.patch
	drm-nouveau-uvmm-fix-null-deref-unwinding-an-op_map_sparse-op.patch
	drm-nouveau-uvmm-fix-premature-region-free-on-failed-op_unmap_sparse.patch