struct regulator_ops *ops is a member in struct regulator_desc, which gets
its value from individual regulator driver upon regulator_register() and
is used by regulator core APIs. It's not allowed for regulator core to
modify any of these callbacks in *ops. Add 'const' qualifier to enforce that.
Signed-off-by: NGuodong Xu <guodong.xu@linaro.org>
Signed-off-by: NMark Brown <broonie@linaro.org>