mei: trace pci configuration space io

Use tracing events also for reading and writing pci configuration space
<debugfs>/tracing/events/mei/mei_pci_reg_{read,write}

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>