OvmfPkg/QemuFlashFvbServicesRuntimeDxe: drop unused PCDs
    
    The only two OvmfPkg references to "PcdFlashNvStorageVariableBase" are the
    spurious ones in the runtime DXE driver and the SMM driver INF files of
    the QEMU flash driver. Remove these references.
    
    The flash driver does not access "PcdOvmfFlashNvStorageEventLogBase"
    either, so remove that from the INF files too.
    
    Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Cc: Jordan Justen <jordan.l.justen@intel.com>
    Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
    Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=386
    Signed-off-by: Laszlo Ersek <lersek@redhat.com>
    Message-Id: <20200310222739.26717-2-lersek@redhat.com>
    Acked-by: Leif Lindholm <leif@nuviainc.com>