drm/i915: Nuke the cursor size defines

No point in having this extra indireciton for the cursor max size.
So drop the defines and just write out the raw numbers. Makes it
easier to see what's going on.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180615174406.12258-1-ville.syrjala@linux.intel.com


Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>