board: tbs2910: Add CMD_PART

There is no stable mmcblk device numbering over different linux versions.
Enable CMD_PART to be able to query the UUID of the root filesystem partition.
So we can pass root=PARTUUID=XXX instead of root=/dev/mmcblkXpY in bootargs.
Leave the default environment as is for now to stay compatible with original
TBS settings.

Signed-off-by: Soeren Moch <smoch@web.de>

include/configs/tbs2910.h

@@ -56,9 +56,11 @@
 
 /* *** Command definition *** */
 #define CONFIG_CMD_BMODE
+#define CONFIG_CMD_PART
 
 /* Filesystems / image support */
 #define CONFIG_EFI_PARTITION
+#define CONFIG_PARTITION_UUIDS
 
 /* MMC */
 #define CONFIG_SYS_FSL_USDHC_NUM	3