[U-Boot] Fix misaligned buffer in env_fat_save

[Tom Rini]

On Wed, Feb 07, 2018 at 08:01:54PM +0000, Alex Kiernan wrote:

> When saving the environment on a platform which has DMA alignment
> larger than the natural alignment, env_fat_save triggers a debug
> message in file_fat_write:
> 
>   Saving Environment to FAT... writing uboot.env
>   FAT: Misaligned buffer address (9df1c8e0)
>   OK
> 
> Signed-off-by: Alex Kiernan <alex.kiernan at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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