drm/i915/fbc: s/intel_fbc_hw_tracking_covers_screen()/intel_fbc_surface_size_ok()/

drm/i915/fbc: s/intel_fbc_hw_tracking_covers_screen()/intel_fbc_surface_size_ok()/

Rename intel_fbc_hw_tracking_covers_screen() to intel_fbc_surface_size_ok()
so that the naming scheme is the same for the surface size vs. plane
size checks. "surface size" is what bspec talks about.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240705145254.3355-7-ville.syrjala@linux.intel.com
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>