Revert "USB: serial: add usbid for dell wwan card to sierra.c"

This reverts commit 1ebca9da.

This device was erroneously added to the sierra driver even though it's
not a Sierra device and was already handled by the option driver.

Cc: Richard Farina <sidhayn@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>