media: Revert "media: vimc: Remove or modify stream checks"

This reverts commit 3c1b9ac7.

Required to Revert "media: vimc: propagate pixel format in the stream"
which introduced the stream object in the vimc_ent_device struct.

Signed-off-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Lucas A. M. Magalhaes <lucmaga@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>