arm: rpi: Define CONFIG_TFTP_TSIZE to show tftp size info

This shows a proper progress display and the total amount of data
transferred. Enable it for Raspberry Pi.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>

include/configs/rpi.h

@@ -106,6 +106,7 @@
 #define CONFIG_USB_STORAGE
 #define CONFIG_USB_HOST_ETHER
 #define CONFIG_USB_ETHER_SMSC95XX
+#define CONFIG_TFTP_TSIZE
 #define CONFIG_MISC_INIT_R
 #define CONFIG_USB_KEYBOARD
 #define CONFIG_SYS_USB_EVENT_POLL