mainboard/hp: Add HP Elitebook 8770w

This is based on the code from the 8470p port. Tested on the quad
core/quad SODIMM version. This laptop uses discrete MXM 3.0b graphics
cards. Tested working with both Quadro K3000M and GTX 980M 8GB. The
laptop must be completely disassembled down to the motherboard to
perform the initial flash, subsequent flashes can be done internally
via flashrom. There is a simple mod that can be performed to make
subsequent external flashes easier in case of a brick, I'll put more
information on this on the wiki later. The lack of an MXM structure
built in to the firmware causes the GPU to enter a mode with nerfed
performance, there is a workaround though, I'll add this to the wiki
as well. I have no info on EHCI debugging.

Tested and working:
- memory: 4G+4G, 4G+4G+4G+4G
- Linux (Debian Stretch with kernel 4.9.0) booted from SeaBIOS payload
with graphics init disabled in coreboot. I allowed SeaBIOS to load the
VBIOS from the MXM.
- WLAN
- keyboard, trackpoint and touchpad
- USB
- serial port on dock
- fan control
- VGA
- DisplayPort
- Audio
- Both HDD SATA ports, ODD SATA, eSATA
- S3 with SeaBIOS 1.11, SERCON must be disabled
- Brightness and volume FN keys
- Mute and calculator hotkeys
- Status LEDs
- Bluetooth

Not working:
- GRUB2 as payload will freeze. Has something to do with at_keyboard
module. The built in keyboard requires this module to function though.
- Sleep FN key
- WiFi toggle and internet browser hotkeys
- S3 fails to resume (restarts) if the laptop is removed from AC power,
or gets unplugged and then plugged back in while suspended. Sleep
status LEDs remain normal during this process.

Change-Id: Ic4ff64e9cf0c7a51ac48ca2fe6fe8beab02e9f9a
Signed-off-by: Robert Reeves <xiinc37@gmail.com>
Reviewed-on: https://review.coreboot.org/23651
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

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