drm/i915/gvt: include intel_display_limits.h where needed
In this case, it's actually gvt.h that needs I915_MAX_PORTS etc. from
intel_display_limits.h. Make this more evident by moving the include
there, instead of getting it via fb_decoder.h.
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/30696b712f4beba171c15765632ad9c3e1b8b1d1.1767180318.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>