USB: qcserial: add Sierra Wireless EM74xx device ID

[ Upstream commit 9b957cf794b46861c6b797b816fb31c8f73859d4 ]

[ Upstream commit 04fdbc825ffc02fb098964b92de802fff44e73fd ]

The MC74xx and EM74xx modules use different IDs by default, according
to the Lenovo EM7455 driver for Windows.

Cc: <stable@vger.kernel.org>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>