drm/xe: Remove unnecessary drm_mm.h includes

These includes are no longer necessary, and where appropriate
are replaced by the linux/types.h one.

Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240821193842.352557-3-rodrigo.vivi@intel.com


Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>