[U-Boot] env: restore old env_get_char() behaviour

[Tom Rini]

On Fri, Feb 09, 2018 at 08:23:17PM +0000, Goldschmidt Simon wrote:

> With multiple environments, the 'get_char' callback for env
> drivers does not really make sense any more because it is
> only supported by two drivers (eeprom and nvram).
> 
> To restore single character loading for these drivers,
> override 'env_get_char_spec'.
> 
> Signed-off-by: Simon Goldschmidt <sgoldschmidt at de.pepperl-fuchs.com>
> Acked-by: Maxime Ripard <maxime.ripard at bootlin.com>

Applied to u-boot/master, thanks!

-- 
Tom
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