drm/i915: Include "ignore lines" in skl+ wm state

We'll need to poke at the "ignore lines" bit in the skl+
watermark registers for a w/a. Include that bit in the wm
state.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190213165424.22904-2-ville.syrjala@linux.intel.com


Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>