drm/xe/bo: Fix swapin when moving to VRAM

drm/xe/bo: Fix swapin when moving to VRAM

When a source system resource had been swapped out, we incorrectly
assumed that we were lacking source data for a move and therefore
cleared the destination instead of swapping in and copying the
swapped-out data. Fix this.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230626181741.32820-2-thomas.hellstrom@linux.intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>