net : update enum entry for netlink_sockev.

Update netlink_sockev enum entry to maintain same
binary with different kernels .

CRs-Fixed: 2284498
Change-Id: I392212b5559b3c0f4c2ddbbdfaaa2fd4aa9147ee
Acked-by : Manoj Basapathi <manojbm@qti.qualcomm.com>
Signed-off-by: Devi Sandeep Endluri V V <dendluri@codeaurora.org>