drm/i915: Limit display Wa_1405510057 to gen11

TGL+ supposedly do not need Wa_1405510057 so limit it to
gen11 only.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200128155152.21977-2-ville.syrjala@linux.intel.com


Reviewed-by: Imre Deak <imre.deak@intel.com>