Add Alder Lake support

Loosely based on commit 11680db4 (ichspi: Add Alder Lake support)
on flashrom master.

Beside a little change in descriptor detection, no difference to
Tiger Lake was found. Hence, add new PCI IDs as 500 series.

Change-Id: Icc1278755ff64f03128d8faadbca85a4ff76864d
Signed-off-by: Nico Huber <nico.h@gmx.de>
3 files changed