drm/xe: covert sysfs over to devm

Hotunplugging the device seems to result in stuff like:

kobject_add_internal failed for tile0 with -EEXIST, don't try to
register things with the same name in the same directory.

We only remove the sysfs as part of drmm, however that is tied to the
lifetime of the driver instance and not the device underneath. Attempt
to fix by using devm for all of the remaining sysfs stuff related to the
device.

Closes: drm/xe/kernel#1667
Closes: drm/xe/kernel#1432


Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>