media: zoran: zoran does not support STD_ALL

In fact, zoran does not support V4L2_STD_ALL, so let's enumerate what we
support.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>