usb: add new scsi_huawei eject3 & eject4 sequences

Add new Huawei eject3 and eject4 command sequences.

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

(cherry picked from commit 7d4b2b5834dba66732596d68d7f817d18affb67f)
(cherry picked from commit 356e03eace327e3b255834d4a1e6a7278663ce85)