arm: am335x: Enable tiny printf in SPL

am335x_evm SPL is very close to its limit in SRAM space.
Switch to use tiny printf to reclaim some size.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 6d8c3e4..5bca20e 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -135,6 +135,7 @@
 config AM33XX
 	bool "AM33XX SoC"
 	imply SYS_THUMB_BUILD
+	imply USE_TINY_PRINTF
 	help
 	  Support for AM335x SOC from Texas Instruments.
 	  The AM335x high performance SOC features a Cortex-A8