Initial support for watchdog block included in ROHM BD70528
power management IC.

Configurations for low power states are still to be checked.
Signed-off-by: NMatti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@linux-watchdog.org>