env: restore old env_get_char() behaviour
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: NSimon Goldschmidt <sgoldschmidt@de.pepperl-fuchs.com> Acked-by: NMaxime Ripard <maxime.ripard@bootlin.com>
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