drm/xe: Remove double pageflip

This is already handled below in the code by fixup_initial_plane_config.

Fixes: a8153627 ("drm/i915: Try to relocate the BIOS fb to the start of ggtt")
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241210083111.230484-3-dev@lankhorst.se


Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>