console: Introduce console_start() and console_stop()
In the future we would like to stop unused consoles and also add a reference counting to avoid imbalanced calls to ->start() and ->stop() in some cases. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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