drm/i915/pfit: Check pipe source size against pfit limits on ILK-BDW

drm/i915/pfit: Check pipe source size against pfit limits on ILK-BDW

The ILK-BDW panel fitter imposes extra limits on the maximum
pipe source size we can use. Check for that.

Only HSW/BDW are really affected by this since on older platforms
the max hdisplay/vdisplay matches the max PIPESRC. But we'll
put in the limits for all the platforms just to keep things
clear.

Note that pch_panel_fitting() is also used on SKL+, but we'll
skip the checks for those as it's all supposed to be handled
in the unified scaler code.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016143134.26903-2-ville.syrjala@linux.intel.com
Acked-by: Jani Nikula <jani.nikula@intel.com>