arm: kirkwood: ib62x0: drop CONFIG_CMD_ENV define

The CONFIG_CMD_ENV is enabled by default so we can safely remove it.

Signed-off-by: Luka Perkov <luka.perkov@sartura.hr>
diff --git a/include/configs/ib62x0.h b/include/configs/ib62x0.h
index 73caaca..ad966bd 100644
--- a/include/configs/ib62x0.h
+++ b/include/configs/ib62x0.h
@@ -42,7 +42,6 @@
  */
 #define CONFIG_SYS_NO_FLASH		/* declare no flash (NOR/SPI) */
 #define CONFIG_SYS_MVFS
-#define CONFIG_CMD_ENV
 #define CONFIG_CMD_BOOTZ
 #define CONFIG_CMD_IDE
 #define CONFIG_CMD_MII