greybus: camera: Add support for flags to stream_configure

Add support for the flags field of the stream configure request that was
recently added to the camera protocol and update the debugfs arguments
parsing accordingly. The stream configure response layout is also
updated to the latest protocol specification.

Signed-off-by: Jacopo Mondi <jacopo.mondi@linaro.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>