ARM: dts: renesas: r7s72100: Add BSC node

Add a minimal device node for the Bus State Controller (BSC) on the
RZ/A1H SoC, to be extended by board DTS files for devices residing in
the BSC external address space.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/ccab4fa198225edcd3750f62532a1ee3c6d2a109.1693481518.git.geert+renesas@glider.be

arch/arm/boot/dts/renesas/r7s72100.dtsi

@@ -36,6 +36,13 @@ b_clk: b {
 		clock-div = <3>;
 	};
 
+	bsc: bsc {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0 0x18000000>;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;