media: ti-vpe: cal: Create consistent naming for CAMERARX functions

Rename all functions related to CAMERARX with a cal_camerarx_ prefix,
and pass them a cal_camerarx pointer. This performs most of the
decoupling of the CAMERARX from the context.

Signed-off-by: Laurent Pinchart <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
Reviewed-by: Benoit Parrot <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>