mb/asrock/q1900m: Add new mainboard

This is a µATX mainboard with a Celeron J1900 and two DDR3 DIMM slots.

Working:
 - Both DIMM slots
 - Serial port to emit spam
 - Some USB ports
 - Integrated graphics (libgfxinit)
 - HDMI, DVI and VGA
 - Realtek GbE
 - Both SATA ports
 - RAM initialization with MRC binary
 - Flashing with flashrom
 - SeaBIOS and TianoCore to boot Arch Linux

Not working:
 - Something stalls the system for 30 seconds at boot.

Untested
 - VGA BIOS
 - PCIe ports
 - Audio
 - S3 suspend/resume
 - Front USB headers
 - PS/2 connectors
 - TPM header
 - Non-Linux OSes
 - Parallel port
 - IRQ routing

Change-Id: Id029074e4231db231a68bc92a4210dc052bba1c9
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
---
A src/mainboard/asrock/q1900m/Kconfig
A src/mainboard/asrock/q1900m/Kconfig.name
A src/mainboard/asrock/q1900m/Makefile.inc
A src/mainboard/asrock/q1900m/acpi/ec.asl
A src/mainboard/asrock/q1900m/acpi/superio.asl
A src/mainboard/asrock/q1900m/acpi_tables.c
A src/mainboard/asrock/q1900m/board_info.txt
A src/mainboard/asrock/q1900m/data.vbt
A src/mainboard/asrock/q1900m/devicetree.cb
A src/mainboard/asrock/q1900m/dsdt.asl
A src/mainboard/asrock/q1900m/fadt.c
A src/mainboard/asrock/q1900m/gma-mainboard.ads
A src/mainboard/asrock/q1900m/gpio.c
A src/mainboard/asrock/q1900m/irqroute.c
A src/mainboard/asrock/q1900m/irqroute.h
A src/mainboard/asrock/q1900m/romstage.c
16 files changed, 567 insertions(+), 0 deletions(-)