FROMGIT: Revert "xfrm: state and policy should fail if XFRMA_IF_ID 0"

This reverts commit 68ac0f3810e76a853b5f7b90601a05c3048b8b54 because ID
0 was meant to be used for configuring the policy/state without
matching for a specific interface (e.g., Cilium is affected, see
https://github.com/cilium/cilium/pull/18789 and
https://github.com/cilium/cilium/pull/19019

).

Signed-off-by: Kai Lueke <kailueke@linux.microsoft.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Link: https://lore.kernel.org/netdev/20220309130839.3263912-3-steffen.klassert@secunet.com/
(cherry picked from commit a3d9001b4e287fc043e5539d03d71a32ab114bcb
 https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=a3d9001b4e287fc043e5539d03d71a32ab114bcb)
Bug: 221187056
Test: run_net_test.sh
Change-Id: Iccaf42f776cad9166f808c490bfce586f850554c