drm/xe: Basic SVM BO eviction

drm/xe: Basic SVM BO eviction

Wire xe_bo_move to GPU SVM migration via new helper xe_svm_bo_evict.

v2:
 - Use xe_svm_bo_evict
 - Drop bo->range
v3:
 - Kernel doc (Thomas)
v4:
 - Add missing xe_bo.c code
v5:
 - Add XE_BO_FLAG_CPU_ADDR_MIRROR flag in this patch (Thomas)
 - Add message on eviction failure
v6:
 - 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>
Link: https://patchwork.freedesktop.org/patch/msgid/20250306012657.3505757-29-matthew.brost@intel.com