drm/i915: Update Haswell PCI IDs

Reclassify 0x0426 as GT3 (GT2+) according to specifications and the second
least significant digit.

Signed-off-by: Alexei Podtelezhnikov <apodtele@gmail.com>
[vsyrjala: s/GT2/GT3/ in the comment]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716172106.2656-2-ville.syrjala@linux.intel.com


Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>