libcamera: v4l2_videodevice: Clarify V4L2M2MDevice

The documentation seems to suggest that to create a new M2M
execution context it is expected users to call V4L2M2MDevice::open()
multiple times on the same video device path.

It is instead expected that multiple instances of the class are
created, one for each required execution context.

Clarify it in the documentation of the V4L2M2MDevice class.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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