FROMGIT: media: s5p-mfc: Use display delay and display enable std controls

Use the standard display_delay and display_delay_enable controls,
the legacy private MFC controls are kept for backward compatibility.

Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
(cherry picked from commit c3042bff
 git://linuxtv.org/media_tree.git master)
Bug: 183580457
Link: https://lkml.org/lkml/2021/1/15/179



Change-Id: Ia465c279d704ab4b2c71d96c769e40a1634d0fe2
Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>