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>
diff --git a/configs/x600_defconfig b/configs/x600_defconfig
index a1b2e33..71dc7dc 100644
--- a/configs/x600_defconfig
+++ b/configs/x600_defconfig
@@ -9,3 +9,4 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_NETDEVICES=y
 CONFIG_ETH_DESIGNWARE=y
+CONFIG_USE_TINY_PRINTF=y