armv8: dts: ls1088a: add PSCI binding for LS1088A

This allows the use of PSCI calls to trusted firmware to
initiate reset and poweroff events with CONFIG_PSCI_RESET and
CONFIG_ARM_PSCI_FW. This is desirable, for example, if the target
board has implemented a custom reset or poweroff procedure in EL3.

Signed-off-by: Mathew McBride <matt@traverse.com.au>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

arch/arm/dts/fsl-ls1088a.dtsi

@@ -192,4 +192,9 @@
 		status = "disabled";
 	};
 
+	psci {
+		compatible = "arm,psci-0.2";
+		method = "smc";
+	};
+
 };