ARM: dts: stm32: bump PSCI to version 1.0 on stm32mp15x

Declare PSCI v1.0 support instead of v0.1 as the former is supported
by the PSCI firmware stacks stm32mp15x relies on.
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp151.dtsi

@@ -24,10 +24,8 @@ cpu0: cpu@0 {
 	};
 
 	psci {
-		compatible = "arm,psci";
+		compatible = "arm,psci-1.0";
 		method = "smc";
-		cpu_off = <0x84000002>;
-		cpu_on = <0x84000003>;
 	};
 
 	intc: interrupt-controller@a0021000 {