imx: ventana: disable 4k tftp/nfs packets

I've encountered issues when using 4k packets through certain switches. For
now disable this and go back to using MTU size packets.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/include/configs/gw_ventana.h b/include/configs/gw_ventana.h
index 620f950..e60173f 100644
--- a/include/configs/gw_ventana.h
+++ b/include/configs/gw_ventana.h
@@ -115,11 +115,6 @@
 #define CONFIG_CMD_UBIFS
 #define CONFIG_DOS_PARTITION
 
-/* Network config - Allow larger/faster download for TFTP/NFS */
-#define CONFIG_IP_DEFRAG
-#define CONFIG_TFTP_BLOCKSIZE 4096
-#define CONFIG_NFS_READ_SIZE  4096
-
 /*
  * SATA Configs
  */