net: Revert upstream changes which break routing in tunnel scenarios

This reverts the following -

commit f1900fb5 ("net: Really fix vti6 with oif in dst
lookups")
'commit 4148987a ("net: Fix vti use case with oif in dst
lookups for IPv6")
commit 42a7b32b ("xfrm: Add oif to dst lookups")

Routing in tunneled scenarios are completely broken due to these
upstream commits. Revert these changes as a workaround till a
solution is determined internally and is accepted upstream.

CRs-Fixed: 1039009
Change-Id: I4e02573bc6dadf8d1a2ce50313e6d0c6e6a0e599
Acked-by: Abhinav Kannan <kannana@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>