cam: Move camera session creation and monitoring setup to run()

Move creation of the camera session and setup of the hotplug monitoring
from the init() function to the run() function, to group all the code
that performs operations based on command line options in a single
place. The cleanup() call on session creation failure isn't required
anymore, as the cleanup() function is called unconditionally upon return
from run().

This change allows merging two different code blocks related to hotplug
monitoring.

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

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