regulator: fixed: honour optionality of enable gpio
According to the binding documentation the fixed regulator enable GPIO is optional. However so far registration thereof failed if no enable GPIO was specified. Fix this by making it entirely optional whether an enable GPIO is used. Signed-off-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com> Acked-by: NStephen Warren <swarren@nvidia.com> Signed-off-by: NTom Warren <twarren@nvidia.com>
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