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: Gajendra Singh <gajendra@qti.qualcomm.com>
Change-Id: Ib364a82e883de7ea642bdd1d85c44eef1f54a086
Signed-off-by: Aman Gupta <amangupt@codeaurora.org>