regulator: palmas: clear sleep bits if not selected

Clear the sleep/warm reset bits when it is not selected through
regulator platform data. This will make sure that configuration
is inline with the platform data regardless of boot/POR
configuration.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>