ubifs: Allow ubifsmount volume reference by number

UBI can mount volumes by name or number  The current code forces you
to name the volume by prepending every name with "ubi:".

>From fs/ubifs/super.c
 * There are several ways to specify UBI volumes when mounting UBIFS:
 * o ubiX_Y    - UBI device number X, volume Y;
 * o ubiY      - UBI device number 0, volume Y;
 * o ubiX:NAME - mount UBI device X, volume with name NAME;
 * o ubi:NAME  - mount UBI device 0, volume with name NAME.

Now any name passed in any of the above forms are allowed.

Also update the configs that referenced ubifsmount.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/include/configs/dockstar.h b/include/configs/dockstar.h
index 249f93b..63d5e35 100644
--- a/include/configs/dockstar.h
+++ b/include/configs/dockstar.h
@@ -85,7 +85,7 @@
 #define CONFIG_BOOTCOMMAND \
 	"setenv bootargs ${console} ${mtdparts} ${bootargs_root}; "	\
 	"ubi part root; " \
-	"ubifsmount root; " \
+	"ubifsmount ubi:root; " \
 	"ubifsload 0x800000 ${kernel}; " \
 	"ubifsload 0x1100000 ${initrd}; " \
 	"bootm 0x800000 0x1100000"