u3g: Add new 4G Huawei devices

New 4G devices. Longer description of new modes to follow.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/633
Approved by: re (cperciva)

(cherry picked from commit 75d41cb6967bef0e534afd6d20ea5eeeb2435e36)
(cherry picked from commit 9786ac44efd689018ee8dafa4fb231cdba366e94)