net: rmnet_data: Add snapshot of rmnet_data driver

This is a snapshot of the rmnet_data driver taken as of msm-4.9
commit c85bfbe2e8e2ffd ("net: rmnet_data: Unset logical end points
in bridge mode").

CRs-Fixed: 2086060
Change-Id: I02917bd21a21d8876f02fd9b82378898341e2277
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>