regulator: palmas: configure enable time for LDOs
regulator: palmas: configure enable time for LDOs

As per datasheet (Referred TPS65913), the on-time for LDO is
500micro second. If LDO6 is in vibrator mode then the on-time
is 2000us.

Set the enable_time on regulator descriptor accordingly.

Signed-off-by: Laxman Dewangan <8ef6cd53fa4ede16d655e2562b753173823989c1@nvidia.com>
Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@linaro.org>

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