Removed "route add" in rndis usb mode

Removed "route add" in rndis usb mode

Ifconfig command will also automatically add route information to the routing table in the kernel.
So if you run "route add" additionally, you have duplicate routing table entries.

sh-3.2# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.0.1     0.0.0.0         UG    0      0        0 wlan0
cns1.sec.samsun 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
cns2.sec.samsun 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
192.168.0.0     *               255.255.255.0   U     0      0        0 wlan0
192.168.0.1     *               255.255.255.255 UH    0      0        0 wlan0
192.168.129.0   *               255.255.255.0   U     0      0        0 usb0   <== here
192.168.129.0   *               255.255.255.0   U     0      0        0 usb0   <== here

Change-Id: I96c290ce5de1da81ff7b9f99cfaefc8a64b618ac