net: Kconfig changes to enable sfe feature

Shortcut forward Engine (SFE) is a software packet accelerator
It depends on packet tuple entries based on conntrack information
The change adds its config entry in net Kconfig.

Change-Id: Ied018e83e26f69682590989242b333754f367556
Signed-off-by: Aman Gupta <amangupt@codeaurora.org>