media: Kconfig: reorganize the drivers menu options

The comments before some of the drivers support look
weird, because their Kconfig have their own "comment"
directive inside it. So, rearrange them to make it
look a little nicer for the ones with are not too
familiar with the media system.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>