meson: Convert `v4l2` into a feature option

The v4l2 compatibility layer does not have external dependencies,
the usual benefits of a feature option do not apply. The main
motivation behind this change is making use of the `auto_features`
meson option that can change all feature options set to "auto"
by default to the desired value.

This can be useful for two reasons: (1) using auto_features=disabled
and then building up the list of features that are desired in the
particular build; (2) using auto_features=enabled to achieve
(usually) more testing and compilation coverage.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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