SELinux: 0/3-v3 clean up locking and semaphore usage

The following patch set attempts to do a little cleanup in SELinux code concerning the usage of semaphores which we init to 1. First off there is nothing wrong with semaphores but with the introduction of simple mutexes a slightly faster interface is available (see Documentation/mutex-design.txt) Since mutexes save time and space I'm going to deal with both of the semaphores I see in the selinux code. (isec->sem and sbsec->sem)

-Eric

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