imx6: add back bootargs

They make our life easier when testing ramdisk images.

Signed-off-by: Luka Perkov <luka@openwrt.org>

SVN-Revision: 38420

target/linux/imx6/files-3.10/arch/arm/boot/dts/imx6q-gw5400-a.dts

@@ -48,6 +48,10 @@
 		usdhc3 = &usdhc4;
 	};
 
+	chosen {
+		bootargs = "console=ttymxc1,115200";
+	};
+
 	memory {
 		reg = <0x10000000 0x40000000>;
 	};

target/linux/imx6/files-3.10/arch/arm/boot/dts/imx6q-gw54xx.dts

@@ -50,6 +50,10 @@
 		usdhc3 = &usdhc4;
 	};
 
+	chosen {
+		bootargs = "console=ttymxc1,115200";
+	};
+
 	memory {
 		reg = <0x10000000 0x40000000>;
 	};