UPSTREAM: USB: option: add ZTE MF821D

UPSTREAM: USB: option: add ZTE MF821D

Sold by O2 (telefonica germany) under the name "LTE4G"

Tested-by: Thomas Schäfer <tschaefer@t-online.de>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 09110529780890804b22e997ae6b4fe3f0b3b158)

Change-Id: I76097c70b04b835739dd7c49cbb227663aa40b82
Signed-off-by: Ben Chan <benchan@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50563
Reviewed-by: Olof Johansson <olofj@chromium.org>