ARM: kirkwood: Cleanup comments in Sheevaplug dts files

Change the file names given in the comments of the Sheevaplug
dts files to actually match the real file names.
Signed-off-by: NSimon Baatz <gmbnomis@gmail.com>
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/kirkwood-sheevaplug-common.dtsi

 /*
- * kirkwood-sheevaplug-common.dts - Common parts for Sheevaplugs
+ * kirkwood-sheevaplug-common.dtsi - Common parts for Sheevaplugs
  *
  * Copyright (C) 2013 Simon Baatz <gmbnomis@gmail.com>
  *

arch/arm/boot/dts/kirkwood-sheevaplug.dts

 /*
- * kirkwood-sheevaplug-esata.dts - Device tree file for Sheevaplug
+ * kirkwood-sheevaplug.dts - Device tree file for Sheevaplug
  *
  * Copyright (C) 2013 Simon Baatz <gmbnomis@gmail.com>
  *