PCI Express 6.0 Specification introduces new registers and modifies
fields in existing ones.
This commit syncs PciE headers with the spec update.
Cc: Sergiy Yakovlev <sergiyy@ami.com>
Cc: Felix Polyudov <felixp@ami.com>
Cc: Dhanaraj V <vdhanaraj@ami.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Sachin Ganesh <sachinganesh@ami.com>
