linux-imx

dt-bindings: mfd: Add link to ROHM BD71847 Datasheet

ROHM BD71847 PMIC datasheet was published.
Add datasheet link for BD71847 as well.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>