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/tricorder.h b/include/configs/tricorder.h
index 1a665ac..ebd7a25 100644
--- a/include/configs/tricorder.h
+++ b/include/configs/tricorder.h
@@ -193,7 +193,7 @@
 		"bootm ${loadaddr}\0" \
 	"loaduimage_ubi=mtd default; " \
 		"ubi part fs; " \
-		"ubifsmount root; " \
+		"ubifsmount ubi:root; " \
 		"ubifsload ${loadaddr} /boot/uImage\0" \
 	"nandboot=echo Booting from nand ...; " \
 		"run nandargs; " \