arm: dts: ti: omap: omap36xx: Rename opp_supply nodename

Use opp-supply as the proper node name.
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Message-ID: <20230724153911.1376830-2-nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/ti/omap/omap36xx.dtsi

@@ -71,7 +71,7 @@ opp1g-1000000000 {
 		};
 	};
 
-	opp_supply_mpu_iva: opp_supply {
+	opp_supply_mpu_iva: opp-supply {
 		compatible = "ti,omap-opp-supply";
 		ti,absolute-max-voltage-uv = <1375000>;
 	};