arm64: dts: rockchip: Add Engicam EDIMM2.2 Starter Kit

Engicam EDIMM2.2 Starter Kit is an EDIMM 2.2 Form Factor Capacitive
Evaluation Board.

Genaral features:
- LCD 7" C.Touch
- microSD slot
- Ethernet 1Gb
- Wifi/BT
- 2x LVDS Full HD interfaces
- 3x USB 2.0
- 1x USB 3.0
- HDMI Out
- Mini PCIe
- MIPI CSI
- 2x CAN
- Audio Out

SOM's like PX30.Core needs to mount on top of this Evaluation board
for creating complete PX30.Core EDIMM2.2 Starter Kit.

Add support for it.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Link: https://lore.kernel.org/r/20200929083217.25406-3-jagan@amarulasolutions.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/px30-engicam-common.dtsi

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2020 Engicam srl
+ * Copyright (c) 2020 Amarula Solutions
+ * Copyright (c) 2020 Amarula Solutions(India)
+ */
+
+/ {
+	vcc5v0_sys: vcc5v0-sys {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0_sys";	/* +5V */
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+	};
+};
+
+&gmac {
+	clock_in_out = "output";
+	phy-supply = <&vcc_3v3>;	/* +3V3_SOM */
+	snps,reset-active-low;
+	snps,reset-delays-us = <0 50000 50000>;
+	snps,reset-gpio = <&gpio2 RK_PB5 GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};
+
+&sdmmc {
+	cap-sd-highspeed;
+	card-detect-delay = <800>;
+	vmmc-supply = <&vcc_3v3>;	/* +3V3_SOM */
+	vqmmc-supply = <&vcc_3v3>;
+	status = "okay";
+};
+
+&uart2 {
+	pinctrl-0 = <&uart2m1_xfer>;
+	status = "okay";
+};

arch/arm64/boot/dts/rockchip/px30-engicam-edimm2.2.dtsi

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2020 Engicam srl
+ * Copyright (c) 2020 Amarula Solutions(India)
+ */
+
+#include "px30-engicam-common.dtsi"