ARM: rmobile: Add Beacon EmbeddedWorks RZG2M Dev Kit

The Beacon EmbeddedWorks kit is based on the R8A774A1 SoC also
known as the RZ/G2M.

The kit consists of a SOM + Baseboard and supports microSD,
eMMC, Ethernet, a couple celular radios, two CAN interfaces,
Bluetooth and WiFi.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/arch/arm/dts/r8a774a1-beacon-rzg2m-kit-u-boot.dtsi b/arch/arm/dts/r8a774a1-beacon-rzg2m-kit-u-boot.dtsi
new file mode 100644
index 0000000..a0c0a7f
--- /dev/null
+++ b/arch/arm/dts/r8a774a1-beacon-rzg2m-kit-u-boot.dtsi
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2020 Compass Electronics Group, LLC
+ */
+
+/ {
+	soc {
+		u-boot,dm-pre-reloc;
+	};
+};
+
+&cpg {
+	u-boot,dm-pre-reloc;
+};
+
+&extal_clk {
+	u-boot,dm-pre-reloc;
+};
+
+&prr {
+	u-boot,dm-pre-reloc;
+};
+
+&extalr_clk {
+	u-boot,dm-pre-reloc;
+};
+
+&sdhi0 {
+	/delete-property/ cd-gpios;
+};
+
+&sdhi2 {
+	status = "disabled";
+};