Add support to set voltage/current of various regulators
to power up/down Bluetooth chip wcn3990.
Signed-off-by: NBalakrishna Godavarthi <bgodavar@codeaurora.org>
Reviewed-by: NMatthias Kaehlcke <mka@chromium.org>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>