Add array controls to test support for such controls. There is one
array with just one element, one 8x16 matrix control and one 4 dimensional
2x3x4x5 control.

This makes it possible to experiment with such controls without requiring
hard-to-get hardware.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>