USB: serial: pl2303: add device id for Macrosilicon MS3020

commit 7d47d224 upstream.

Add the device id for the Macrosilicon MS3020 which is a
PL2303HXN based device.

Signed-off-by: Junhao Xie <bigfoot@classfun.cn>
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>