class: change internal semaphore to a mutex

Now that the lockdep infrastructure in the class core is in place, we
should be able to properly change the internal class semaphore to be a
mutex.

David wrote the original patch, and Greg fixed it up to apply properly
due to all of the recent changes in this area.

From: Dave Young <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Kay Sievers <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: James Bottomley <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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