Set MTU for RNDIS interface to 1428

The MTU setting of RNDIS inerface has been broken since ICS.
The patch writes the mtu value on the rndis0 interface after gagets
functions were enabled and before sys.usb.state property is updated.

Bug:5847206
Change-Id: Ib44e41b07d9859a13875ddd964ce5068cde7b0e2
2 files changed