media: i2c: ds90ub9xx: Set serializer temperature ramp

For continuous PLL lock, it is recommended to extend the temperature
ramp down range of the DS90UB953-Q1 serializer based on the device's
initial temperature [1].

The serializer's die temperature is reported only to the deserializer
through the sensor status registers, and for UB9702, it is recommended
to set the temperature ramp during the link setup sequence, i.e. before
we even probe the ub953 driver.

Add support to the deserializer driver to configure ub953's temperature
ramp.

[1]: Section 7.3.1.1 - https://www.ti.com/lit/gpn/ds90ub953-q1



Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>