axm/taurus: Enable tiny printf in SPL

Both of these boards are very close to their limit and with some toolchains
such as gcc 5.x are too large.  Switch to tiny printf to reclaim some size.

Signed-off-by: Tom Rini <trini@konsulko.com>

configs/axm_defconfig

@@ -12,3 +12,4 @@ CONFIG_SYS_EXTRA_OPTIONS="AT91SAM9G20,MACH_TYPE=2068,BOARD_AXM"
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_USE_TINY_PRINTF=y

configs/taurus_defconfig

@@ -13,3 +13,4 @@ CONFIG_SYS_PROMPT="U-Boot> "
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_USE_TINY_PRINTF=y