[media] s5p-jpeg: Allow for wider JPEG subsampling scope for Exynos4x12 encoder

Exynos4x12 supports wider scope of subsampling modes than
S5PC210. Adjust corresponding mask accordingly.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>