USB: gadget: rndis: Add module parameter for DL max packets per xfer

Currently DL aggregation is supported in RNDIS driver and is set
to 3 by default. And there is no support to change downlink maximum
packets per transfer at runtime through module parameter. Hence add
module parameter for DL maximum packets per transfer to change it at
runtime.

echo 6 > /sys/module/usb_f_rndis/parameters/rndis_dl_max_pkt_per_xfer

To disable DL aggregation during runtime,

echo 1 > /sys/module/usb_f_rndis/parameters/rndis_dl_max_pkt_per_xfer.

Change-Id: I3a1d0bc97358e2b6f233df7ae8725fb507de50db
Git-Commit: cdffcb845ee56ce6d0b55200f7909ab954e92ec4
Git-repo: https://source.codeaurora.org/quic/la/kernel/msm-4.9


Signed-off-by: Xerox Lin <xerox_lin@htc.com>
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>