greybus: camera: Add support for configure streams flag in gb interface

Update gb interface and export flags needed for latest
protocol version. Number of streams also can be changed
based on operation result.
Caller sets input flags, end fucntion return output
flags

Input flags supported:
- GB_CAMERA_IN_FLAG_TEST - Need to be set when operation
is not actually applied.

Output flags supported:
- GB_CAMERA_OUT_FLAG_ADJUSTED - This is result of the operation
if this flag is set, result is adjusted and operation
need to be repeat.

Signed-off-by: Gjorgji Rosikopulos <grosikopulos@mm-sol.com>
Acked-by: Laurent Pinchart <laurent.pinchart@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>