Add support for Comet Lake-U/400-series PCH

Add enum CHIPSET_400_SERIES_COMET_POINT and treat it identically
to CHIPSET_300_SERIES_CANNON_POINT.

Add PCI IDs for Comet Lake, CML-U Premium and classify as CHIPSET_400_SERIES_COMET_POINT.

Test: read/write unlocked CML-U board

flashrom-stable:
As suggested above, treat it the same as 300 series. But don't add a
new enum.

Change-Id: I43b4ad1eecfed16fec59863e46d4e997fbe45f1b
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/44420
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Original-Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/71325
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/ich_descriptors.c b/ich_descriptors.c
index 2e9d0f8..5f581b6 100644
--- a/ich_descriptors.c
+++ b/ich_descriptors.c
@@ -103,7 +103,7 @@
 		"5 series Ibex Peak", "6 series Cougar Point", "7 series Panther Point",
 		"8 series Lynx Point", "Baytrail", "8 series Lynx Point LP", "8 series Wellsburg",
 		"9 series Wildcat Point", "9 series Wildcat Point LP", "100 series Sunrise Point",
-		"C620 series Lewisburg", "300 series Cannon Point", "Apollo Lake",
+		"C620 series Lewisburg", "300/400 series Cannon/Comet Point", "Apollo Lake",
 	};
 	if (cs < CHIPSET_ICH8 || cs - CHIPSET_ICH8 + 1 >= ARRAY_SIZE(chipset_names))
 		cs = 0;