chipset_enable.c: Mark Intel Q75 as DEP

Tested reading, writing and erasing the internal flash chip using an HP
Pro 6300 SFF mainboard with an Intel Q75 PCH. However, since ME-enabled
chipsets are marked as DEP instead of OK, this one shall also be.

Change-Id: I273af0eb33e74b31bc4fdc95362527bba080c5a0
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/35826


Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>