vxlan: Create wrappers for FDB lookup

__vxlan_find_mac() is called from both the data path (e.g., during
learning) and the control path (e.g., when replacing an entry). The
function is missing lockdep annotations to make sure that the FDB hash
lock is held during FDB updates.

Rename __vxlan_find_mac() to vxlan_find_mac_rcu() to reflect the fact
that it should be called from an RCU read-side critical section and call
it from vxlan_find_mac() which checks that the FDB hash lock is held.
Change callers to invoke the appropriate function.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20250415121143.345227-13-idosch@nvidia.com
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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