sony-laptop: Prepare the platform driver for multiple users.
Both the SNC and SPIC device drivers will create attributes and thus there's the need to have an internal usage count to avoid re-registering or de-registering at the wrong time. Signed-off-by: NMattia Dongili <malattia@linux.it> Signed-off-by: NLen Brown <len.brown@intel.com>
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