drm/xe: Add unbind to SVM garbage collector

Add unbind to SVM garbage collector. To facilitate add unbind support
function to VM layer which unbinds a SVM range. Also teach PT layer to
understand unbinds of SVM ranges.

v3:
 - s/INVALID_VMA/XE_INVALID_VMA (Thomas)
 - Kernel doc (Thomas)
 - New GPU SVM range structure (Thomas)
 - s/DRM_GPUVA_OP_USER/DRM_GPUVA_OP_DRIVER (Thomas)
v4:
 - Use xe_vma_op_unmap_range (Himal)
v5:
 - s/PY/PT (Thomas)

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/20250306012657.3505757-17-matthew.brost@intel.com