media: atomisp: Drop support for streaming from 2 sensors at once

With support for depth mode gone there really is no need to support
streaming from 2 sensors at once. As discussed and acked on the list
(see Link tag) it is desirable to drop support for this since it
involves quite a lot of special handling / hacks in the code.

This initial commit limits itself to a minimum set of changes to switch
to 1 struct atomisp_sub_device / 1 stream. Further commits will actually
remove / cleanup much of the special handling.

Likewise this initial commit also deliberately skips the opportunity to
turn some multi-line statements into single-line statements, so as to
keep the diff small / easier to review.

Link: https://lore.kernel.org/linux-media/[email protected]/

Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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