[media] Exynos4 JPEG codec v4l2 driver

Add driver for the JPEG codec IP block available in Samsung Exynos SoC series.

The driver is implemented as a V4L2 mem-to-mem device. It exposes two video
nodes to user space, one for the encoding part, and one for the decoding part.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Sakari Ailus <sakari.ailus@iki.fi>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>