FROMGIT: media: docs: Deprecate mfc display delay controls

Deprecate mfc private display delay and display enable controls for
new clients and use the standard controls instead.

Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
(cherry picked from commit 644bcc03
 git://linuxtv.org/media_tree.git master)
Bug: 183580457
Link: https://lkml.org/lkml/2021/1/15/175



Change-Id: Ifdb228bcb395391160727fc98852a2ace6903d2d
Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>