UefiCpuPkg: Add BaseRiscV64CpuTimerLib library

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

Add the RISC-V instance of the TimerLib.

This is mostly copied from
edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVTimerLib

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: Abner Chang <abner.chang@amd.com>
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>
Acked-by: Ray Ni <ray.ni@Intel.com>

UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.uni

@@ -0,0 +1,14 @@
+// /** @file
+// Base CPU Timer Library for RISC-V
+//
+// Copyright (c) 2023, Ventana Micro Systems Inc. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "RISC-V CPU Timer Library"
+
+#string STR_MODULE_DESCRIPTION          #language en-US "Provides basic timer support for RISC-V."
+