[U-Boot] stm32f4: fix gpio description in comment

[Tom Rini]

On Wed, Jul 01, 2015 at 04:04:14PM +0800, Antonio Borneo wrote:

> On STM32F429 gpio PC6/PC7 can be allocated for USART6, as
> reported in the comment.
> But current code in
> 	drivers/serial/serial_stm32.c
> uses a different gpio mapping (PG14/PG9) for USART6.
> 
> Fix the comment to match current code in the driver.
> 
> Signed-off-by: Antonio Borneo <borneo.antonio at gmail.com>
> To: u-boot at lists.denx.de
> To: Kamil Lulko <rev13 at wp.pl>
> Cc: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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