netlink: Queue the kernel socket after setting the flag.

Queueing the socket after setting the NETLINK_KERNEL_SOCKET on the
kernel socket.

This change is required in-order to avoid the BUG check which is
caused due to race condition between setting this flag and a
message from the app space for this kernel netlink sock.

Change-Id: I19a8edf2fe009a3020b194684a6172654f8f257a
CRs-Fixed: 681815
Signed-off-by: Vinay Krishna Eranna <veran@codeaurora.org>