debug_uart: output CR along with LF

The serial output from the debug UART carries on going far to the
right in the console.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed