[U-Boot] serial: Remove duplicated line in Makefile

[Tom Rini]

On Mon, Apr 16, 2018 at 10:35:08AM +0200, Patrice Chotard wrote:

> The line "-obj-$(CONFIG_STM32_SERIAL) += serial_stm32.o"
> is found twice in Makefile.
> 
> Fixes: ae74de0dfd45 ("serial: stm32: Rename serial_stm32x7.c to serial_stm32.c"
> 
> Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
> Acked-by: Vikas Manocha <vikas.manocha at st.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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