regulator: core: Use dev_get_regmap() to find the regmap
If no regmap is explicitly specified then use dev_get_regmap() to obtain one. The driver must explicitly enable any actual usage of the regmap so there's no concern with unwanted usage. Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: NLiam Girdwood <lrg@ti.com>
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