drm/i915: Just use icl+ definition for PLANE_WM blocks field
The unused bits on PLANE_WM & co. are hardwired to zero. So no need to worry about reading the extra bit on pre-icl. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190205205056.30081-2-ville.syrjala@linux.intel.comReviewed-by: NJosé Roberto de Souza <jose.souza@intel.com>
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