media: platform: s5p-jpeg: move config to its own file

In order to better organize the platform/Kconfig, place
s5p-jpeg-specific config stuff on a separate Kconfig file.

Acked-by: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>