intel: Introducing Whiskey Lake platform

Whiskey Lake uses the same gen graphics as Coffe Lake, including some
ids that were previously marked as reserved on Coffe Lake, but that
now are moved to WHL page.

This follows the ids and approach used on kernel's commit
b9be78531d27 ("drm/i915/whl: Introducing Whiskey Lake platform")
and commit c1c8f6fa731b ("drm/i915: Redefine some Whiskey Lake SKUs")

v2: Lionel noticed that GT{1,2,3} on kernel wasn't following
spec when looking to number of EUs, so kernel has been updated.

Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Anuj Phogat <anuj.phogat@gmail.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
(cherry picked from commit 24db1c7f)