mb/gigabyte/ga-h61m-series: Initial GA-H61M-S2P-R3 bringup

mb/gigabyte/ga-h61m-series: Initial GA-H61M-S2P-R3 bringup

Working:
 - Both DIMM slots
 - All Rear USB 2.0 ports
 - Integrated graphics (libgfxinit)
 - Realtek RTL8111F GbE
 - Flashing internally with flashrom (Note: Works from stock too
        due to Gigabyte not following Intel recommendations,
        confusing ME)
 - SeaBIOS (1.16.3) to boot Arch Linux Installer
 - EDK II (uefipayload_202309, MrChromebox) to boot Arch Linux Installer
 - Audio output (green jack, rear)
 - S3 suspend/resume
 - VBT

Untested for now (i.e. should work, will eventually test):
 - EHCI debug
 - Front USB 2.0 ports
 - The other audio jacks
 - PCIe ports
 - Non-Linux OSes

Untestable (i.e. cannot test due to unavailable hardware):
 - PS/2 port
 - Serial port
 - SATA ports

Not working:
 - USB 3.0 ports: The on-board VLI VL805 does not have a flash chip,
   so its firmware needs to be loaded on each boot. However,
   documentation about the (chip-specific) firmware loading procedure
   is nowhere to be found.
 - Super I/O automatic fan control: not yet implemented in coreboot.
   To control fans, use software fan control methods in the meantime.

Change-Id: I106c195c890823f07227739c6b30133b996f6510
Signed-off-by: PugzAreCute <me@pugzarecute.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83267
Reviewed-by: Nicholas Chin <nic.c3.14@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>