ArmVirtPkg: Kvmtool: Add RNG support using Arm TRNG interface

Bugzilla: 3668 (https://bugzilla.tianocore.org/show_bug.cgi?id=3668)

The EFI_RNG_PROTOCOL published by RngDxe has been updated to
implement the EFI_RNG_ALGORITHM_RAW using the Arm TRNG interface
to provide access to entropy.

Therefore, enable EFI_RNG_PROTOCOL for the Kvmtool guest/virtual
firmware.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

ArmVirtPkg/ArmVirtKvmTool.dsc

@@ -81,6 +81,9 @@
   HwInfoParserLib|DynamicTablesPkg/Library/FdtHwInfoParserLib/FdtHwInfoParserLib.inf
   DynamicPlatRepoLib|DynamicTablesPkg/Library/Common/DynamicPlatRepoLib/DynamicPlatRepoLib.inf
 
+  ArmMonitorLib|ArmPkg/Library/ArmMonitorLib/ArmMonitorLib.inf
+  ArmTrngLib|ArmPkg/Library/ArmTrngLib/ArmTrngLib.inf
+
 [LibraryClasses.common.SEC, LibraryClasses.common.PEI_CORE, LibraryClasses.common.PEIM]
   PciExpressLib|MdePkg/Library/BasePciExpressLib/BasePciExpressLib.inf
   PlatformHookLib|ArmVirtPkg/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.inf
@@ -112,6 +115,8 @@
   # Use MMIO for accessing RTC controller registers.
   gPcAtChipsetPkgTokenSpaceGuid.PcdRtcUseMmio|TRUE
 
+  gArmTokenSpaceGuid.PcdMonitorConduitHvc|TRUE
+
 [PcdsFixedAtBuild.common]
   gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel|0x8000000F
 
@@ -362,6 +367,11 @@
   OvmfPkg/VirtioPciDeviceDxe/VirtioPciDeviceDxe.inf
   OvmfPkg/Virtio10Dxe/Virtio10.inf
 
+  #
+  # Rng Support
+  #
+  SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf
+
 !if $(ARCH) == AARCH64
   #
   # ACPI Support

ArmVirtPkg/ArmVirtKvmTool.fdf

@@ -224,6 +224,11 @@ READ_LOCK_STATUS   = TRUE
   #
   INF MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDxe.inf
 
+  #
+  # Rng Support
+  #
+  INF SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf
+
 [FV.FVMAIN_COMPACT]
 FvAlignment        = 16
 ERASE_POLARITY     = 1