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Mirroring commit 97ab802aa36f ("adc: meson-saradc: add support for getting reference voltage value") for meson-saradc, this adds support for getting the "vref-supply" regulator and register it as the ADC's reference voltage regulator, so clients can translate sampled ADC values to voltage. Signed-off-by: Peter Cai <peter@typeblog.net> Reviewed-by: John Keeping <john@metanate.com> Tested-by: John Keeping <john@metanate.com> Cc: Simon Glass <sjg@chromium.org> Cc: Philipp Tomsich <philipp.tomsich@vrull.eu> Cc: Kever Yang <kever.yang@rock-chips.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>