board: rockchip: add Khadas Edge2 RK3588 board

Khadas Edge2 is a Rockchip RK3588S based SBC (Single Board Computer)
by Khadas.

There are tree variants depending on the DRAM size : 8G and 16G.

Specification:

    Rockchip RK3588S SoC
    4x ARM Cortex-A76, 4x ARM Cortex-A55
    8/16GB memory LPDDR4x
    Mali G610MP4 GPU
    3x MIPI CSI 4x lanes
    2x MIPI-DSI DPHY 4x lanes
    32/64GB eMMC
    1x USB 2.0, 1x USB 3.0, 2x USB-Type-C
    1x HDMI 2.1 output, 1x DP 1.4 output
    USB PD over USB Type-C

Kernel commit:
04d552993522 ("arm64: dts: rockchip: Add Khadas edge2 board")

Signed-off-by: Jacobe Zang <jacobe.zang@wesion.com>
diff --git a/include/configs/khadas-edge2-rk3588s.h b/include/configs/khadas-edge2-rk3588s.h
new file mode 100644
index 0000000..d279cf3
--- /dev/null
+++ b/include/configs/khadas-edge2-rk3588s.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2024 Khadas Technology Co., Ltd.
+ */
+
+#ifndef __KHADAS_EDGE2_RK3588_H
+#define __KHADAS_EDGE2_RK3588_H
+
+#include <configs/rk3588_common.h>
+
+#define ROCKCHIP_DEVICE_SETTINGS \
+		"stdout=serial,vidconsole\0" \
+		"stderr=serial,vidconsole\0"
+
+#endif /* __KHADAS_EDGE2_RK3588_H */