drm/xe: Use correct type width for alignment in fb pinning code

Plane->min_alignment returns an unsigned int so lets use that in the whole
relevant call chain.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250307111402.26577-5-tvrtko.ursulin@igalia.com


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