arm64: dts: renesas: Add HiHope RZ/G2H sub board support

The HiHope RZ/G2H sub board sits below the HiHope RZ/G2H main board.
These boards are identical with the ones for RZ/G2M[N].
Signed-off-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/1594230511-24790-9-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/Makefile

@@ -19,6 +19,7 @@ dtb-$(CONFIG_ARCH_R8A774C0) += r8a774c0-ek874-idk-2121wr.dtb
 dtb-$(CONFIG_ARCH_R8A774C0) += r8a774c0-ek874-mipi-2.1.dtb
 
 dtb-$(CONFIG_ARCH_R8A774E1) += r8a774e1-hihope-rzg2h.dtb
+dtb-$(CONFIG_ARCH_R8A774E1) += r8a774e1-hihope-rzg2h-ex.dtb
 
 dtb-$(CONFIG_ARCH_R8A77950) += r8a77950-salvator-x.dtb
 dtb-$(CONFIG_ARCH_R8A77950) += r8a77950-ulcb.dtb

arch/arm64/boot/dts/renesas/hihope-rzg2-ex.dtsi

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Device Tree Source for the RZ/G2[MN] HiHope sub board common parts
+ * Device Tree Source for the RZ/G2[HMN] HiHope sub board common parts
  *
  * Copyright (C) 2019 Renesas Electronics Corp.
  */

arch/arm64/boot/dts/renesas/r8a774e1-hihope-rzg2h-ex.dts

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree Source for the HiHope RZ/G2H sub board
+ *
+ * Copyright (C) 2020 Renesas Electronics Corp.
+ */
+
+#include "r8a774e1-hihope-rzg2h.dts"
+#include "hihope-rzg2-ex.dtsi"
+
+/ {
+	model = "HopeRun HiHope RZ/G2H with sub board";
+	compatible = "hoperun,hihope-rzg2-ex", "hoperun,hihope-rzg2h",
+		     "renesas,r8a774e1";
+};