console: Keep ->start() and ->stop() balanced
There is no need to call ->start() for already started device. All the same, there is no need to call ->stop() for devices still in use. For now enforce this only for IOMUX case. Cc: Simon Glass <sjg@chromium.org> Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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