[qca-nss-drv] add supporting multi-tun6rd interface

We change that we support multi-tun6rd interface .
in the old version, it support only one tun6rd interface.
and more, here we support remote any 6rd tunnel interface.

Change-Id: Ib740b21770bb5f01d83c509e368e2c05c40c4b74
Signed-off-by: Zhu Ken <guigenz@codeaurora.org>
8 files changed