net: Kernel changes for Generic Software Bridge(GSB)

Changes are made to let GSB intercept network packets and consume them
when possible. The goal is to bridge the packets directly to backhaul
without letting packet do a round trip through the network stack.

Acked-by: Vinisha Varre <vvarre@qti.qualcomm.com>
Signed-off-by: Justin Tee <justint@codeaurora.org>
Change-Id: I274da3196b4488f80ff9fc223d1f6ba0d04d3832