net: fix to handle warning message

This change will unregister the queue handler before registering for SIP
nf queue handler.

Change-Id: Ifd2316d428970d28c6d988e6e54ec67d1760b011
Acked-by: Suraj Jaiswal <c_surajj@qti.qualcomm.com>
Signed-off-by: Utkarsh Saxena <usaxena@codeaurora.org>