[U-Boot] env_mmc: support overriding mmc dev from board code

[Tom Rini <trini@konsulko.com>]

On Wed, Jan 20, 2016 at 03:43:37PM +0100, Clemens Gruber wrote:

> This enables boards to choose where to/from the environment should be
> saved/loaded. They can then for example support using the same device
> (dynamically) from which the bootloader was launched to load and save
> env data and do not have to define CONFIG_SYS_MMC_ENV_DEV statically.
> 
> In my use case, the environment needs to be on the same device I
> booted from. It can be the eMMC or an optional SD card.
> I therefore would override mmc_get_env_dev in the board code, read the
> CPU registers to determine where we booted from and return the
> corresponding device index.
> 
> Cc: Tom Rini <trini@konsulko.com>
> Cc: Stephen Warren <swarren@nvidia.com>
> Cc: Tim Harvey <tharvey@gateworks.com>
> Cc: Simon Glass <sjg@chromium.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> 
> Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
> Reviewed-by: Stephen Warren <swarren@nvidia.com>
> Reviewed-by: Tom Rini <trini@konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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