gst: libcamerasrc: Prevent src task deadlock on exhausted buffer pool

Allow GstLibcameraPool to notify the source when a new buffer has become
available in a previously exhausted buffer pool. This can be used to
resume a src task that got paused because it couldn't acquire a buffer.

Without this change the src task will never resume from pause once the
pool gets exhausted.

To trigger the deadlock (it doesn't happen every time), run:

  gst-launch-1.0 libcamerasrc ! queue ! glimagesink

Signed-off-by: Jakub Adam <jakub.adam@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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