usb: f_qc_rndis: Correct SSUSB descriptor with IAD information

Currently SSUB descriptor is using rndis.c related descriptor
which is not being updated at binding time. Hence windows host
is not able to load RNDIS driver identifying both Control and
Data Interfaces. Update the same which is being updated and used
by qc_rndis.c file to resolve this issue.

Change-Id: I6788059bf247dc5f767970ef76a10351ed83dbb1
Signed-off-by: Mayank Rana <mrana@codeaurora.org>