power: regulator: add dummy helper
Add dummy helper to enabling the header could be included when
DM REGULATOR not enabled.
Signed-off-by: 
Peng Fan <peng.fan@nxp.com>
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Add dummy helper to enabling the header could be included when
DM REGULATOR not enabled.
Signed-off-by: Peng Fan <peng.fan@nxp.com>