glink: Loopback transport and edge renaming

The loopback transport and edge names are changed as
per design document.

Old name ------------------- New Name
local_loopback_xprt          lloop
local_loopback               local

Change-Id: Id27a12d855996bc88aeb3e9ef96aefa812de6988
Signed-off-by: Atish Kumar Patra <apatra@codeaurora.org>