regulator: Handle regulators without suspend mode configuration

Since some regulators in the system may not support suspend mode
configuration we need to allow some regulators to have a missing
suspend mode configuration. Do this by requiring that disabled
regulators are explicitly flagged and then skip over regulators
that have no state specified.

Try to avoid surprises by warning the if we could set the state
but no configuration is provided.  This also ensures that an all
zeros configuration generates a warning rather than silently
disabling the regulator.

Reported-by: Joonyoung Shim <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Liam Girdwood <[email protected]>

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