ARM: dts: rmobile: Synchronize Gen2 DTs with Linux 5.0

Synchronize R-Car Gen2 device trees with Linux 5.0,
commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/dts/r8a7794.dtsi b/arch/arm/dts/r8a7794.dtsi
index ea2ca4b..8d797d3 100644
--- a/arch/arm/dts/r8a7794.dtsi
+++ b/arch/arm/dts/r8a7794.dtsi
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Device Tree Source for the r8a7794 SoC
+ * Device Tree Source for the R-Car E2 (R8A77940) SoC
  *
  * Copyright (C) 2014 Renesas Electronics Corporation
  * Copyright (C) 2014 Ulrich Hecht
@@ -1349,7 +1349,6 @@
 		du: display@feb00000 {
 			compatible = "renesas,du-r8a7794";
 			reg = <0 0xfeb00000 0 0x40000>;
-			reg-names = "du";
 			interrupts = <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 268 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&cpg CPG_MOD 724>, <&cpg CPG_MOD 723>;