wcnss: new SMD control channel with WCNSS

A new SMD control channel is opened with WCNSS, currently only the
version information is exchanged thru this channel. WCNSS version is
exposed thru /sys interface.

Change-Id: I45638bdd992846fa6087b6131180684d30805002
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>