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 <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>