drivers: rtc: max313xx: Add delay after setting date

drivers: rtc: max313xx: Add delay after setting date

The MAX31331 was not correctly updating the seconds when
setting the time and would return the seconds previously set.

Like the MAX31343, a delay needs to be added after setting the
time. Wait one second after writing so that the date command shows the
correct time.

Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Bruce Adams <bruce.adams@alliedtelesis.co.nz>
Signed-off-by: Ben Hoelker <ben.hoelker@alliedtelesis.co.nz>