drm/xe: Introduced needs_scratch bit in device descriptor

On some platform, scratch page is needed for out of bound prefetch
to work. Introduce a bit in device descriptor to specify whether
this device needs scratch page to work.

v2: introduce a needs_scratch bit in device info (Thomas, Jonathan)
v3: drop NEEDS_SCRATCH macro (Matt)

Signed-off-by: Oak Zeng <oak.zeng@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://lore.kernel.org/r/20250403165328.2438690-2-oak.zeng@intel.com


Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>