spl: Allow tiny printf() to be controlled in SPL and TPL

At present there is only one control for this and it is used for both SPL
and TPL. But SPL might have a lot more space than TPL so the extra cost of
a full printf() might be acceptable.

Split the option into two, providing separate SPL and TPL controls. The
TPL setting defaults to the same as SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3b0e315..7086db3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -954,7 +954,7 @@
 	select USB if DISTRO_DEFAULTS
 	select USB_KEYBOARD if DISTRO_DEFAULTS
 	select USB_STORAGE if DISTRO_DEFAULTS
-	select USE_TINY_PRINTF
+	select SPL_USE_TINY_PRINTF
 	imply CMD_DM
 	imply CMD_GPT
 	imply CMD_UBI if NAND