REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1496 This commit copies the exact 8254TimerDxe driver from PcAtChipsetPkg to OvmfPkg. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Ray Ni <ray.ni@intel.com> Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>