Extract intel_fbc_max_surface_size() from
intel_fbc_hw_tracking_covers_screen(), mainly to mirror the
"max plane size" counterparts.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240705145254.3355-6-ville.syrjala@linux.intel.comReviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>