mfd: Add missing mutex.h inclusion to WM8994 core.h
struct wm8994 includes a mutex so we need to include mutex.h before we declare it. All current users rely on this being done implicitly. Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>
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