arm: spear: x600: Enable tiny-printf

Enabling the new tiny-printf function makes the SPL image fit again in
the 8KiB restricted area.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Tom Rini <trini@konsulko.com>

configs/x600_defconfig

@@ -9,3 +9,4 @@ CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_NETDEVICES=y
 CONFIG_ETH_DESIGNWARE=y
+CONFIG_USE_TINY_PRINTF=y