drm/i915: Try to fix the SKL GT3/4 vs. GT3e/4e comments

Bunch of the SKL SKUs currently documented as GT3/4 seem to actually
be GT3e/4e. Fix up the comments.

Cc: Alexei Podtelezhnikov <apodtele@gmail.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716172106.2656-6-ville.syrjala@linux.intel.com


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