Revert "net: Add l3mdev index to flow struct and avoid oif reset for port devices"

This reverts commit 740de198 which is
commit 40867d74 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I338a2fc5a37732a8e54dfdadf37b360cd1881991
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>