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>
Tested-by: Jakov Petrina <jakov.petrina@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Change-Id: If39d9bb1acd4029f802a44a2940dd23f66ba09b1
Reviewed-on: https://review.coreboot.org/c/flashrom/+/44162
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
1 file changed