USB: f_qc_rndis: Change descriptors to support wireless RNDIS

Change required descriptors settings to pass as wireless RNDIS
so that driver will be auto-detected by windows. This installs
RNDIS driver automatically without manual intervention, when USB
tethering is enabled.

Change-Id: Ib4a8ab166cac212e041f13ed13d8ac5f59aec425
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>