[media] media: tvp514x: remove field description

This patch removes the field description of fields that no
longer exists, along side aligns the field description of
fields.

Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>