media: v4l2-ctrls: optimize type_ops for arrays

Initializing arrays and validating or checking for equality of arrays
is suboptimal since it does this per element.

Change the ops to operate on the whole payload to speed up array
operations.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>