ARM: dts: rmobile: Add Renesas Ebisu board support

Basic support for the Renesas Ebisu board based on R-Car E3:
  - Memory,
  - Main crystal,
  - Serial console,

Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[shimoda: rebase and add SPDX-License-Identifier]
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index a0349a8..6df8bc2 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -439,6 +439,7 @@
 	r8a7796-salvator-x.dtb \
 	r8a77965-salvator-x.dtb \
 	r8a77970-eagle.dtb \
+	r8a77990-ebisu.dtb \
 	r8a77995-draak.dtb
 
 dtb-$(CONFIG_SOC_KEYSTONE) += keystone-k2hk-evm.dtb \