stdio: Make use of the SERIAL define

This is always enabled for U-Boot proper, so simplify the condition
in the common Makefile.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/include/stdio.h b/include/stdio.h
index 7b999a5..e732579 100644 (file)
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -9,10 +9,7 @@ int getchar(void);
 int tstc(void);
 
 /* stdout */
-#if !defined(CONFIG_SPL_BUILD) || \
-       (defined(CONFIG_TPL_BUILD) && defined(CONFIG_TPL_SERIAL)) || \
-       (defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD) && \
-               defined(CONFIG_SPL_SERIAL))
+#if !defined(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(SERIAL)
 void putc(const char c);
 void puts(const char *s);
 #ifdef CONFIG_CONSOLE_FLUSH_SUPPORT