[U-Boot] am335x_evm: Fix DFU for eMMC

[Tom Rini]

On Tue, Dec 12, 2017 at 08:07:41PM +0200, Sam Protsenko wrote:

> Use dfu_alt_info_emmc variable from include/environment/ti/dfu.h file.
> It was probably overlooked when extracting DFU variables to mentioned
> file.
> 
> This patch fixes DFU on BeagleBone Black, so that we can use commands
> like ones below to upgrade various images on eMMC:
> 
>     => setenv dfu_alt_info $dfu_alt_info_emmc
>     => dfu 0 mmc 1
> 
>     $ dfu-util -D MLO -a MLO.raw
>     $ dfu-util -D u-boot.img -a u-boot.img.raw
> 
> Without this patch, the  user is forced to assign the value to
> dfu_alt_info_emmc manually, which contradicts with instructions [1].
> 
> [1] http://processors.wiki.ti.com/index.php/Linux_Core_U-Boot_User%27s_Guide
> 
> Signed-off-by: Sam Protsenko <semen.protsenko at linaro.org>
> Reviewed-by: Lokesh Vutla <lokeshvutla at ti.com>
> Reviewed-by: Lukasz Majewski <lukma at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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