[L] Change in coreboot[main]: mb/dell: Add OptiPlex 7020/9020 port

[Máté Kukri (Code Review)]

Attention is currently required from: Angel Pons, Michael Büchler, Michał Żygowski, Máté Kukri.

Hello Angel Pons, Martin L Roth, Michael Büchler, Patrick Rudolph, Stefan Reinauer, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/55232?usp=email

to look at the new patch set (#28).

The following approvals got outdated and were removed:
Verified-1 by build bot (Jenkins)

Change subject: mb/dell: Add OptiPlex 7020/9020 port
......................................................................

mb/dell: Add OptiPlex 7020/9020 port

The OptiPlex 7020 and 9020 use physically identical motherboards.

Each model comes in the following form factors:
- 7020: SFF, MT
- 9020: USFF (not currently supported), SFF, MT

(7020 SFF) Boots Linux and Windows 10:
- Tested with an i3-4160 and i5-4460
- DRAM init works using the MRC (4G, 4G+4G)
- iGPU init works using libgfxinit (VGA, 2x DP)
- PCIe 16x: tested, ok
- PCIe 4x: tested, ok
- All USB2 and USB3 ports work
- SMSC SCH5555 Super I/O: serial works, PS/2 untested
- Audio: back and front output works, internal speaker works,
         mic inputs untested
- Ethernet: tested, works

(9020 MT)
- Tested by Michael Büchler (thanks for the overridetree)

Change-Id: Ie7c7089f443aef9890711c4412209bceb1f1e96a
Signed-off-by: Mate Kukri 
---
A src/mainboard/dell/optiplex_9020/Kconfig
A src/mainboard/dell/optiplex_9020/Kconfig.name
A src/mainboard/dell/optiplex_9020/Makefile.inc
A src/mainboard/dell/optiplex_9020/acpi/ec.asl
A src/mainboard/dell/optiplex_9020/acpi/platform.asl
A src/mainboard/dell/optiplex_9020/acpi/superio.asl
A src/mainboard/dell/optiplex_9020/board_info.txt
A src/mainboard/dell/optiplex_9020/bootblock.c
A src/mainboard/dell/optiplex_9020/cmos.default
A src/mainboard/dell/optiplex_9020/cmos.layout
A src/mainboard/dell/optiplex_9020/data.vbt
A src/mainboard/dell/optiplex_9020/devicetree.cb
A src/mainboard/dell/optiplex_9020/dsdt.asl
A src/mainboard/dell/optiplex_9020/gma-mainboard.ads
A src/mainboard/dell/optiplex_9020/gpio.c
A src/mainboard/dell/optiplex_9020/hda_verb.c
A src/mainboard/dell/optiplex_9020/mainboard.c
A src/mainboard/dell/optiplex_9020/overridetree_mt.cb
A src/mainboard/dell/optiplex_9020/romstage.c
19 files changed, 700 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/32/55232/28