[L] Change in coreboot[main]: mb/dell: Add Latitude E6220 (Sandy Bridge)

[Nicholas Chin (Code Review)]

Attention is currently required from: Nicholas Chin.

Nicholas Chin has uploaded a new patch set (#3). ( https://review.coreboot.org/c/coreboot/+/82131?usp=email )

Change subject: mb/dell: Add Latitude E6220 (Sandy Bridge)
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mb/dell: Add Latitude E6220 (Sandy Bridge)

Mainboard is codenamed Vida. I do not physically have this system;
someone with physical access to one sent me the output of autoport which
I then modified to produce this port. This port has not been tested.

The EC is the SMSC MEC5055, which seems to be compatible with the
existing MEC5035 code. As with the other Dell systems with this EC, this
board is assumed to be internally flashable using an EC command that
tells it to pull the FDO pin low on the next boot, which also tells the
vendor firmware to disable all write protections to the flash [1].

[1] https://gitlab.com/nic3-14159/dell-flash-unlock

Change-Id: I570023b0837521b75aac6d5652c74030c06b8a4c
Signed-off-by: Nicholas Chin 
---
M src/mainboard/dell/snb_ivb_latitude/Kconfig
M src/mainboard/dell/snb_ivb_latitude/Kconfig.name
A src/mainboard/dell/snb_ivb_latitude/variants/e6220/early_init.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6220/gpio.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6220/hda_verb.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6220/overridetree.cb
6 files changed, 289 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/31/82131/3