drm/xe: Use managed BO in memirq

drm/xe: Use managed BO in memirq

When probe has an error, the current scheme causes a page fault during
resource unwinding. This happens because GTTMMADR_BAR gets unmapped
before the allocated BO is released via drmm. Switching to a managed BO
that is released via devm solves this ordering issue.

Signed-off-by: Ilia Levi <ilia.levi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241204111655.1293-1-ilia.levi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>