PCI utils

Some basic PCI utilities, like PCI spec match and
address parser, which will be used by multiple PCI
passthrough functionalities.

bp:pci-passthrough-base

Change-Id: I8a77a49c93edf2699bceb6a52dd7f4ae45d577fe
Signed-off-by: Yongli He <yongli.he@intel.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Merge "PCI utils"