PCI/AER: Use kfifo for tracking events instead of reimplementing it

The kernel provides a generic FIFO implementation, so no need to reinvent
that capability in a driver.  Replace the AER-specific implementation with
the kernel-provided kfifo.  Since the interrupt handler producer and work
queue consumer run single threaded, there is no need for additional
locking, so remove that lock, too.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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