Add USB_FUNCTION_GROUP_WITH_POST_SERVICE for cfs post service.
To support CFS acm and rndis mode, add new USB_FUNCTION_GROUP_WITH_POST_SERVICE mode.
Legacy mode : usb prepare --> usb enable --> start sdb, mtp, rndis, and data-router service
CFS sdb, mtp mode : usb prepare -> start sdb and mtp service -> usb enable
CFS acm, rndis mode : usb prepare -> usb enable -> start acm and rndis service
Change-Id: I7199636d0b2bcfeac068e1c1575e89926c8f7134
(cherry picked from commit
6312d5a191ccc31b8c20ec109d4e2e3ba8406899)