ARM: shmobile: r8a7778 dtsi: Add Bus State Controller node

Add a node for the Bus State Controller (BSC) on r8a7778, to which
multiple external devices can be connected.
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7778.dtsi

@@ -41,6 +41,13 @@ aliases {
 		spi2 = &hspi2;
 	};
 
+	bsc: bus@1c000000 {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0 0x1c000000>;
+	};
+
 	ether: ethernet@fde00000 {
 		compatible = "renesas,ether-r8a7778";
 		reg = <0xfde00000 0x400>;