media: i2c: ds90ub960: Fix UB9702 VC map

The driver uses a static CSI-2 virtual channel mapping where all virtual
channels from an RX port are mapped to a virtual channel number matching
the RX port number.

The UB960 and UB9702 have different registers for the purpose, and the
UB9702 version is not correct. Each of the VC_ID_MAP registers do not
contain a single mapping, as the driver currently thinks, but two.

This can cause received VCs other than 0 to be mapped in a wrong way.

Fix this by writing both mappings to each register.

Cc: stable@vger.kernel.org
Fixes: afe267f2 ("media: i2c: add DS90UB960 driver")
Reviewed-by: Jai Luthra <jai.luthra@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>