ARM: dts: renesas: r7s72100: Add missing unit address to bus node

Add missing unit address to bus node to fix the following DTC W=1
warning:

    arch/arm/boot/dts/renesas/r7s72100.dtsi:40.11-46.4: Warning (unit_address_vs_reg): /bus: node has a reg or ranges property, but no unit name

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260327234244.91707-5-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Author: Marek Vasut

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

@@ -37,7 +37,7 @@
 		clock-div = <3>;
 	};
 
-	bsc: bus {
+	bsc: bus@0 {
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;