media: ti-vpe: cal: Inline cal_camerarx_max_lanes() in its only caller

The cal_camerarx_max_lanes() function is a one-liner that has a single
caller. It doesn't improve readability. Inline it in its caller.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.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>