bcm53xx: enable RT-AC87U UART console

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 45690

target/linux/bcm53xx/patches-3.18/351-ARM-BCM5301X-Enable-ChipCommon-UART-serial-console.patch

@@ -124,6 +124,27 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
 +			status = "okay";
 +		};
 +	};
++
+ 	gpio-keys {
+ 		compatible = "gpio-keys";
+ 		#address-cells = <1>;
+--- a/arch/arm/boot/dts/bcm4709-asus-rt-ac87u.dts
++++ b/arch/arm/boot/dts/bcm4709-asus-rt-ac87u.dts
+@@ -24,6 +24,18 @@
+ 		       0x88000000 0x08000000>;
+ 	};
+ 
++	chipcommonA {
++		uart0: serial@0300 {
++			status = "okay";
++			clock-frequency = <125000000>;
++		};
++
++		uart1: serial@0400 {
++			status = "okay";
++			clock-frequency = <125000000>;
++		};
++	};
 +
  	gpio-keys {
  		compatible = "gpio-keys";