media: vimc: fix issues in documentation in vimc-common.h

There are some missing and extra fields and typos in
structs documentations in vimc-common.h. Fix it.

[mchehab+huawei@kernel.org: add a missing ':' after @bayer field]
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>