UefiCpuPkg: Add CpuDxeRiscV64 module

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076

This is copied from
edk2-platforms/Silicon/RISC-V/ProcessorPkg/Universal/CpuDxe
and added the RISCV_EFI_BOOT_PROTOCOL support.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Daniel Schaefer <git@danielschaefer.me>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Abner Chang <abner.chang@amd.com>
Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>

UefiCpuPkg/CpuDxeRiscV64/CpuDxeRiscV64Extra.uni

@@ -0,0 +1,14 @@
+// /** @file
+// CpuDxe Localized Strings and Content
+//
+// Copyright (c) 2016 - 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+#string STR_PROPERTIES_MODULE_NAME
+#language en-US
+"RISC-V Architectural DXE Driver"
+
+