BACKPORT: 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

BUG=none
BRANCH=none
TEST=none

Original-Change-Id: I43b4ad1eecfed16fec59863e46d4e997fbe45f1b
Original-Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/44420
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Original-Reviewed-by: Felix Singer <felixsinger@posteo.net>
(cherry picked from commit b1f858f65b2abd276542650d8cb9e382da258967)

Change-Id: Ib29e564bd996378fc2cd360601701d845e90b38d
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2601890
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Edward O'Callaghan <quasisec@chromium.org>
Auto-Submit: Edward O'Callaghan <quasisec@chromium.org>
diff --git a/programmer.h b/programmer.h
index 17b8fc3..89cefc4 100644
--- a/programmer.h
+++ b/programmer.h
@@ -694,6 +694,7 @@
 	CHIPSET_C620_SERIES_LEWISBURG,
 	CHIPSET_300_SERIES_CANNON_POINT,
 	CHIPSET_APOLLO_LAKE,
+	CHIPSET_400_SERIES_COMET_POINT,
 };