env_nand: Remove DEBUG definition

Signed-off-by: Thomas Weber <weber@corscience.de>

common/env_nand.c

@@ -30,8 +30,6 @@
  * MA 02111-1307 USA
  */
 
-#define DEBUG
-
 #include <common.h>
 #include <command.h>
 #include <environment.h>