drm/xe/svm: Implement prefetch support for SVM ranges

drm/xe/svm: Implement prefetch support for SVM ranges

This commit adds prefetch support for SVM ranges, utilizing the
existing ioctl vm_bind functionality to achieve this.

v2: rebase

v3:
   - use xa_for_each() instead of manual loop
   - check range is valid and in preferred location before adding to
     xarray
   - Fix naming conventions
   - Fix return condition as -ENODATA instead of -EAGAIN (Matthew Brost)
   - Handle sparsely populated cpu vma range (Matthew Brost)

v4:
   - fix end address to find next cpu vma in case of -ENOENT

v5:
   - Move find next vma logic to drm gpusvm layer
   - Avoid mixing declaration and logic

v6:
  - Use new function names
  - Move eviction logic to prefetch_ranges

v7:
  - devmem_only assigned 0
  - nit address

v8:
  - initialize ctx with 0

Cc: Matthew Brost <matthew.brost@intel.com>
Acked-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://lore.kernel.org/r/20250513040228.470682-15-himal.prasad.ghimiray@intel.com
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>