Include RNDIS (Ethernet) function

configname: CONFIG_USB_FUNCTIONFS_RNDIS

USB Gadget Drivers
└─>Include RNDIS (Ethernet) function
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Include an RNDIS (Ethernet) funcion in the Funcion Filesystem.
If you also say "y" to the CDC ECM query above the gadget will
have two configurations.