powerpc/85xx: Enable CMD_REGINFO on corenet boards

Useful for various debug to know how various regsters might be set
in a human readable form.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

include/configs/corenet_ds.h

@@ -569,6 +569,7 @@
 #define CONFIG_CMD_MII
 #define CONFIG_CMD_PING
 #define CONFIG_CMD_SETEXPR
+#define CONFIG_CMD_REGINFO
 
 #ifdef CONFIG_PCI
 #define CONFIG_CMD_PCI