ARM: dts: rmobile: Synchronize Gen3 DTs with Linux 5.2

Backport and squash below Linux 5.2 commits for R-Car Gen3:

Commit id       * Summary line
6fffb98645e67b5   arm64: dts: renesas: r8a77990: ebisu: Add GPIO expander
b068ed6efe6244d   arm64: dts: renesas: r8a77990: Fix SPDX license identifier style
96c25882252704d ! arm64: dts: renesas: r8a7796: remove unneeded sound #address/size-cells
71ac75dffdae2f8   arm64: dts: renesas: r8a77990: ebisu: Enable LVDS1 encoder
9a0ff5c727b60a3   arm64: dts: renesas: r8a77995: draak: Enable LVDS1 encoder
9130c15829846fa   arm64: dts: renesas: ebisu: Fix adv7482 hexadecimal register address
191f7dcd1f5ea1f   arm64: dts: renesas: r8a77965: add SSIU support for sound
a8f6110e64422d5   arm64: dts: renesas: ebisu: Enable VIN5
4162aa9db3d4469   arm64: dts: renesas: r8a77995: draak: Enable CAN0, CAN1
af965ba3248edde   arm64: dts: renesas: r8a77990: Remove invalid compatible value for CSI40
1f4c123a98098cc   arm64: dts: renesas: r8a77990-ebisu: Add BD9571 PMIC
474706117c2baa6   arm64: dts: renesas: ebisu: Add PMIC DDR0 Backup Power config
e2fa79de7ecbef4   arm64: dts: renesas: Update Ebisu and Draak bootargs
de8e8daaf7190ef   arm64: dts: renesas: salvator-common: Sort node label
05f1d882d28b871   arm64: dts: renesas: r8a77995: draak: Fix EthernetAVB phy mode to rgmii
7a516e49d975311   arm64: dts: renesas: use extended audio dmac register
e3414b8c45afa5c   arm64: dts: renesas: salvator-common: Add GPIO keys support
720066d17c973fd   arm64: dts: renesas: r8a7795: Add CMT device nodes
99cb95103e2d058   arm64: dts: renesas: r8a77965: Add CMT device nodes
28a5c61b5136d58   arm64: dts: renesas: r8a77990: Add CMT device nodes
32d622f3290b2a1   arm64: dts: renesas: r8a77965: Remove reg-names of display node

(*) Patch id mismatch between Linux and U-Boot commit.
[!] Dropped changes in arch/arm64/boot/dts/renesas/r8a7796-salvator-xs.dts,
    since the file doesn't exist in the U-Boot tree.

Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
diff --git a/arch/arm/dts/r8a7796-salvator-x.dts b/arch/arm/dts/r8a7796-salvator-x.dts
index b4f9567..2aefa53 100644
--- a/arch/arm/dts/r8a7796-salvator-x.dts
+++ b/arch/arm/dts/r8a7796-salvator-x.dts
@@ -68,6 +68,7 @@
 	ports {
 		/* rsnd_port0 is on salvator-common */
 		rsnd_port1: port@1 {
+			reg = <1>;
 			rsnd_endpoint1: endpoint {
 				remote-endpoint = <&dw_hdmi0_snd_in>;