clk: BD718x7: Do not depend on parent driver data

The bd718x7 only needs a regmap from parent device. This can be
obtained by call to dev_get_regmap. Do not require parent to
populate the driver data for this.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/20210105123028.GA3409663@localhost.localdomain


Signed-off-by: Stephen Boyd <sboyd@kernel.org>