Update EFI_DRIVER_HEALTH_HII_MESSAGE definition from UEFI 2.4 specification to replace Reserved with MessageCode.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Samer El-Haj-Mahmoud elhaj@hp.com 
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg@15894 6f19259b-4bc3-4df7-8a09-765794883524
Add PCI PMC and PMCSR register definitions from PCI Power Management Interface Specification

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Samer El-Haj-Mahmoud elhaj@hp.com 
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg@15895 6f19259b-4bc3-4df7-8a09-765794883524