media: ti-vpe: cal: Store sensor-related data in cal_camerarx

The sensor is connected to the CAMERARX. Store its pointer, as well as
the sensor pixel rate and the endpoint, in the cal_camerarx. This
prepares for decoupling the cal_camerarx and cal_ctx.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>