kirkwood/dockstar: rename partition into ubi to use auto detection of target mtd

the kernel tries to use "ubi" or "data" labeled partition to find it's root filesystem.
dockstar don't need anymore mtdparts= nor root= bootarguments

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

SVN-Revision: 49011

target/linux/kirkwood/patches-3.18/140-dockstar.patch

@@ -25,7 +25,7 @@
 -		label = "data";
 -		reg = <0x0500000 0xfb00000>;
 +	partition@200000 {
-+		label = "root";
++		label = "ubi";
 +		reg = <0x200000 0xfe00000>;
  	};
  };