vxlan: Avoid unnecessary updates to FDB 'used' time

[ Upstream commit 9722f834 ]

Now that the VXLAN driver ages out FDB entries based on their 'updated'
time we can remove unnecessary updates of the 'used' time from the Rx
path and the control path, so that the 'used' time is only updated by
the Tx path.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20250204145549.1216254-8-idosch@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 1f5d2fd1 ("vxlan: Fix NPD in {arp,neigh}_reduce() when using nexthop objects")
Signed-off-by: Sasha Levin <sashal@kernel.org>