drm/xe: Force EXEC_QUEUE_FLAG_KERNEL for kernel internal VMs

drm/xe: Force EXEC_QUEUE_FLAG_KERNEL for kernel internal VMs

VMs created without an associated xe_file originate from kernel
contexts and should use kernel exec queues. Ensure such VMs
create bind exec queues with EXEC_QUEUE_FLAG_KERNEL set.
Let's ensure bind exec queues created for kernel VMs are always
marked with EXEC_QUEUE_FLAG_KERNEL.

Signed-off-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20260211171441.3246686-1-piotr.piorkowski@intel.com