chipset_enable.c: Add support for Intel C620 Series Chipset SPI Controller

Support for the Intel C620 Series Chipset SPI Controller (rev 04) is added
to enable SPI flash access on the following platform:

- Intel Xeon D-2187NT

Support for this controller was shortly tested on the platform above.
The flash is recognized, some regions of the flash are locked.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Original-Tested-by: Jakov Petrina <jakov.petrina@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Change-Id: If39d9bb1acd4029f802a44a2940dd23f66ba09b1
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/44162
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/71318
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/chipset_enable.c b/chipset_enable.c
index d3ae61f..e014d21 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -2027,6 +2027,7 @@
 	{0x8086, 0xa153, B_S,    NT,  "Intel", "QM175",				enable_flash_pch100},
 	{0x8086, 0xa154, B_S,    NT,  "Intel", "CM238",				enable_flash_pch100},
 	{0x8086, 0xa155, B_S,    NT,  "Intel", "QMU185",			enable_flash_pch100},
+	{0x8086, 0xa1a4, B_S,    DEP, "Intel", "C620 Series Chipset (QS/PRQ)",  enable_flash_c620},
 	{0x8086, 0xa1c0, B_S,    NT,  "Intel", "C620 Series Chipset (QS/PRQ)",	enable_flash_c620},
 	{0x8086, 0xa1c1, B_S,    NT,  "Intel", "C621 Series Chipset (QS/PRQ)",	enable_flash_c620},
 	{0x8086, 0xa1c2, B_S,    NT,  "Intel", "C622 Series Chipset (QS/PRQ)",	enable_flash_c620},