ARM: dts: BCM63xx: Add SMP nodes and required properties

Update bcm63138.dtsi with the following:

- enable-method for both CPU nodes
- brcm,bcm63138-bootlut node
- resets properties to point to the correct PMB controller to release
  the secondary CPU from reset
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm63138.dtsi

@@ -26,6 +26,7 @@ cpu@0 {
 			compatible = "arm,cortex-a9";
 			next-level-cache = <&L2>;
 			reg = <0>;
+			enable-method = "brcm,bcm63138";
 		};
 
 		cpu@1 {
@@ -33,6 +34,8 @@ cpu@1 {
 			compatible = "arm,cortex-a9";
 			next-level-cache = <&L2>;
 			reg = <1>;
+			enable-method = "brcm,bcm63138";
+			resets = <&pmb0 4 1>;
 		};
 	};
 
@@ -143,5 +146,10 @@ serial1: serial@620 {
 			clock-names = "periph";
 			status = "disabled";
 		};
+
+		bootlut: bootlut@8000 {
+			compatible = "brcm,bcm63138-bootlut";
+			reg = <0x8000 0x50>;
+		};
 	};
 };