board: rockchip: Add Pine64 SOQuartz on Model A

The Pine64 SOQuartz Model A board is a carrier board for the SOQuartz
CM4-compatible compute module. It exposes PCIe, ethernet, USB, HDMI,
CSI, DSI, eDP and a 40 pin GPIO header, and is powered by 12V DC.

Features tested with a SOQuartz 4GB v1.1 2022-07-11:
- SD-card boot
- eMMC boot
- PCIe/NVMe/AHCI
- USB host

Device tree is imported from linux v6.4.

Co-developed-by: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
Signed-off-by: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/doc/board/rockchip/rockchip.rst b/doc/board/rockchip/rockchip.rst
index 9fff5fc..3d2ca19 100644
--- a/doc/board/rockchip/rockchip.rst
+++ b/doc/board/rockchip/rockchip.rst
@@ -98,6 +98,7 @@
      - Hardkernel ODROID-M1 (odroid-m1-rk3568)
      - Pine64 Quartz64-A Board (quartz64-a-rk3566_defconfig)
      - Pine64 Quartz64-B Board (quartz64-b-rk3566_defconfig)
+     - Pine64 SOQuartz on Model A (soquartz-model-a-rk3566_defconfig)
 
 * rk3588
      - Rockchip EVB (evb-rk3588)