IntelSiliconPkg/VtdPmrPei: Add premem support.

Remove memory discovered dependency to support both premem
VTD_INFO_PPI and postmem VTD_INFO_PPI.

If VTD_INFO_PPI is installed before memory is ready, this
driver protects all memory region.
If VTD_INFO_PPI is installed or reinstalled after memory
is ready, this driver allocates DMA buffer and protect rest.

Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
(cherry picked from commit a1e7cd0b02)

IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.inf

@@ -33,6 +33,8 @@
   IntelVTdPmrPei.c
   IntelVTdPmrPei.h
   IntelVTdPmr.c
+  DmarTable.c
+  VtdReg.c
 
 [LibraryClasses]
   DebugLib
@@ -42,17 +44,18 @@
   PeiServicesLib
   HobLib
   IoLib
+  CacheMaintenanceLib
 
 [Ppis]
-  gEdkiiIoMmuPpiGuid            ## PRODUCES
-  gEdkiiVTdInfoPpiGuid          ## CONSUMES
-  gEfiEndOfPeiSignalPpiGuid     ## CONSUMES
+  gEdkiiIoMmuPpiGuid                  ## PRODUCES
+  gEdkiiVTdInfoPpiGuid                ## CONSUMES
+  gEfiPeiMemoryDiscoveredPpiGuid      ## CONSUMES
+  gEfiEndOfPeiSignalPpiGuid           ## CONSUMES
 
 [Pcd]
   gIntelSiliconPkgTokenSpaceGuid.PcdVTdPolicyPropertyMask   ## CONSUMES
 
 [Depex]
-  gEfiPeiMemoryDiscoveredPpiGuid AND
   gEfiPeiMasterBootModePpiGuid AND
   gEdkiiVTdInfoPpiGuid