regulator: ROHM bd7xxxx: Do not depend on parent driver data

The ROHM PMIC regulator drivers only need the regmap pointer from
the parent device. Regmap can be obtained via dev_get_regmap()
so do not require parent to populate driver data for that.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/20210105130221.GA3438042@localhost.localdomain


Signed-off-by: Mark Brown <broonie@kernel.org>