USB: zte_ev: remove duplicate Gobi PID

Remove dublicate Gobi PID 0x9008 which is already handled by the
qcserial driver since commit f05932c0 ("USB: qcserial: Add extra
device IDs").

Fixes: 799ee924 ("USB: serial: add zte_ev.c driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>