Added API definition in ze_device.cpp, and added function declaration of
getPciProperties() in device.h and device_imp.cpp
Initially returns -1 for all values of ze_pci_speed_ext_t for now, simply
because we do not have function to retrieve the information of the PCI
speed.
Related-To: LOCI-2669
Signed-off-by: Young Jin Yoon <young.jin.yoon@intel.com>