serial: Implement default_serial_puts()

U-Boot contains a lot of duplicit implementations of serial_puts()
call which just pipes single characters into the port in loop. Implement
function that does this behavior into common code, so others can make
easy use of it.

This function is called default_serial_puts() and it's sole purpose
is to call putc() in loop on the whole string passed to it.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
diff --git a/include/serial.h b/include/serial.h
index a8d23f5..14f863e 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -20,6 +20,8 @@
 	struct serial_device	*next;
 };
 
+void default_serial_puts(const char *s);
+
 extern struct serial_device serial_smc_device;
 extern struct serial_device serial_scc_device;
 extern struct serial_device *default_serial_console(void);