PrmPkg: Add PlatformGuid

Adds a "platform GUID" field to the PRM ACPI table. This field
is used by a platform to uniquely identify itself such that it
can be targeted by runtime PRM module updates for that platform.

Platforms using PRM are currently required to set a unique value
for gPrmPkgTokenSpaceGuid.PcdPrmPlatformGuid in their platform
DSC.

Cc: Andrew Fish <afish@apple.com>
Cc: Kang Gao <kang.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Benjamin You <benjamin.you@intel.com>
Cc: Liu Yun <yun.y.liu@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Acked-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>
Acked-by: Leif Lindholm <quic_llindhol@quicinc.com>
Reviewed-by: Ankit Sinha <ankit.sinha@intel.com>

PrmPkg/PrmLoaderDxe/PrmLoaderDxe.inf

@@ -31,6 +31,7 @@
 
 [Guids]
   gEfiEndOfDxeEventGroupGuid
+  gZeroGuid
 
 [LibraryClasses]
   BaseLib
@@ -51,6 +52,7 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultOemRevision      ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorId        ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorRevision  ## CONSUMES
+  gPrmPkgTokenSpaceGuid.PcdPrmPlatformGuid                      ## CONSUMES
 
 [Protocols]
   gEfiAcpiTableProtocolGuid