drm/xe/pf: Drop the VF VRAM BO reference on successful restore

drm/xe/pf: Drop the VF VRAM BO reference on successful restore

The reference is only dropped on error. Fix it by adding the missing
xe_bo_put().

Fixes: 49cf1b9b609fe ("drm/xe/pf: Handle VRAM migration data as part of PF control")
Reported-by: Adam Miszczak <adam.miszczak@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20251114100713.1776073-1-michal.winiarski@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
(cherry picked from commit dab751b4240f0f0eadea81f93ff0b439379bc6ae)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>