This patch implements reporting number of NVIDIA Tesla T4
devices connected to a system by discovering such devices
and reporting them through capability 'pci_gpu_devices'.
Change-Id: If713895f05f08a9827c4c085108abb3e388b2a2e
Story: 2008118
Task: 40839
Depends-On: https://review.opendev.org/#/c/750364/