PCI: ibmphp: Turn semaphores into completions or mutexes

The sem_exit variable is conceptually a completion, so it should be called
that.

Similarly, the semOperations semaphore is a simple mutex, and can be
changed into that, respectively.

With both converted, the ibmphp_hpc_initvars() function is no longer used
and can be removed.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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