board: rockchip: Add Hardkernel ODROID-M2

The Hardkernel ODROID-M2 is a single-board computer based on Rockchip
RK3588S2 SoC. It features e.g. 8/16 GB LPDDR5 RAM, 64 GB eMMC, SD-card,
GbE LAN, HDMI 2.0, M.2 NVMe and USB 2.0/3.0/Type-C.

Features tested on a ODROID-M2 16GB rev1.0 20240611:
- SD-card boot
- eMMC boot
- Ethernet
- PCIe/NVMe
- USB gadget
- USB host

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

include/configs/odroid_m2.h

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef __ODROID_M2_H
+#define __ODROID_M2_H
+
+#define ROCKCHIP_DEVICE_SETTINGS \
+	"cramfsaddr=0x0c000000\0"
+
+#include <configs/rk3588_common.h>
+
+#endif