This commit introduces EDKII_PCI_DEVICE_PPI. The purpose of this PPI is
to provide a way of accessing PCI devices to drvice drivers such as
NvmExpressPei or AhciPei.
Cc: Hao A Wu <hao.a.wu@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Signed-off-by: Maciej Czajkowski <maciej.czajkowski@intel.com> Reviewed-by: Hao A Wu <hao.a.wu@intel.com>