drm/xe/vm : Remove duplicate assignment of XE_VM_FLAG_LR_MODE flag.

vm->flags are already assigned with passed flags. Remove the redundant
assignment.

Cc: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Reviewed: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240307065213.1968688-1-himal.prasad.ghimiray@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>