board: rockchip: Add Hardkernel ODROID-M1

Hardkernel ODROID-M1 is a single board computer with a RK3568B2 SoC,
a slightly modified version of the RK3568 SoC.

Features tested on a ODROID-M1 8GB v1.0 2022-06-13:
- SD-card boot
- eMMC boot
- SPI Flash boot
- PCIe/NVMe/AHCI
- SATA port
- USB host

Device tree is imported from linux v6.4.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Tested-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/hardkernel/odroid_m1/MAINTAINERS b/board/hardkernel/odroid_m1/MAINTAINERS
new file mode 100644
index 0000000..165d2d9
--- /dev/null
+++ b/board/hardkernel/odroid_m1/MAINTAINERS
@@ -0,0 +1,8 @@
+ODROID-M1
+M:	Jonas Karlman <jonas@kwiboo.se>
+S:	Maintained
+F:	board/hardkernel/odroid_m1/
+F:	include/configs/odroid_m1.h
+F:	configs/odroid-m1-rk3568_defconfig
+F:	arch/arm/dts/rk3568-odroid-m1.dts
+F:	arch/arm/dts/rk3568-odroid-m1-u-boot.dtsi