Revert "stm32f4: fix serial output"

As per the author, we don't need this patch really since the other patch
"stm32f4: fix serial output" superseded it.

This reverts commit 85e5f5b7.
Signed-off-by: NTom Rini <trini@konsulko.com>

drivers/serial/serial_stm32.c

@@ -128,9 +128,6 @@ static void stm32_serial_putc(const char c)
 	struct stm32_serial *usart =
 		(struct stm32_serial *)usart_base[USART_PORT];
 
-	if (c == '\n')
-		stm32_serial_putc('\r');
-
 	while ((readl(&usart->sr) & USART_SR_FLAG_TXE) == 0)
 		;
 	writel(c, &usart->dr);