brcm63xx: switch to hardware led controllers

Instead of bit banging SPI to talk to the GPIO chip, use the hardware
led controllers intended for controlling the LEDs.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/brcm63xx/dts/bcm63268.dtsi

@@ -210,5 +210,13 @@
 			interrupts = <6>;
 			/* clocks = <&clkctl 16>; */
 		};
+
+		leds: led-controller@10001900 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "brcm,bcm6328-leds";
+			reg = <0x10001900 0x24>;
+			status = "disabled";
+		};
 	};
 };