regulator: core: Don't double-disable supplies in regulator_disable_deferred()

In the commit f8702f9e ("regulator: core: Use ww_mutex for
regulators locking") disabling of the supply was moved into
_regulator_disable().  That means regulator_disable_work() shouldn't
be disabling since that double-disables the supply.

Fixes: f8702f9e ("regulator: core: Use ww_mutex for regulators locking")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>