drm/xe: Add SVM range invalidation and page fault

drm/xe: Add SVM range invalidation and page fault

Add SVM range invalidation vfunc which invalidates PTEs. A new PT layer
function which accepts a SVM range is added to support this. In
addition, add the basic page fault handler which allocates a SVM range
which is used by SVM range invalidation vfunc.

v2:
 - Don't run invalidation if VM is closed
 - Cycle notifier lock in xe_svm_close
 - Drop xe_gt_tlb_invalidation_fence_fini
v3:
 - Better commit message (Thomas)
 - Add lockdep asserts (Thomas)
 - Add kernel doc (Thomas)
 - s/change/changed (Thomas)
 - Use new GPU SVM range / notifier structures
 - Ensure PTEs are zapped / dma mappings are unmapped on VM close (Thomas)
v4:
 - Fix macro (Checkpatch)
v5:
 - Use range start/end helpers (Thomas)
 - Use notifier start/end helpers (Thomas)
v6:
 - Use min/max helpers (Himal)
 - Only compile if CONFIG_DRM_GPUSVM selected (CI, Lucas)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250306012657.3505757-13-matthew.brost@intel.com