arm nomadik: activate defrag choose 4k transfer block size

This chooses 4kB data size for both TFTP and NFS, as an example
about how to use support for IP fragments.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

include/configs/nhk8815.h

@@ -138,6 +138,10 @@
 #define CONFIG_SMC_USE_32_BIT
 #define CONFIG_BOOTFILE		"uImage"
 
+#define CONFIG_IP_DEFRAG	/* Allows faster download, TFTP and NFS */
+#define CONFIG_TFTP_BLOCKSIZE	4096
+#define CONFIG_NFS_READ_SIZE	4096
+
 /* Storage information: onenand and nand */
 #define CONFIG_CMD_ONENAND
 #define CONFIG_MTD_ONENAND_VERIFY_WRITE