media: i2c: ds90ub960: Move all RX port init code into ub960_init_rx_ports()

media: i2c: ds90ub960: Move all RX port init code into ub960_init_rx_ports()

We have some code in probe() which is related to RX port initialization,
and should be in ub960_init_rx_ports(). Move the code there.

We also move ub960_reset() so that it is accessible from
ub960_init_rx_ports().

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
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>