mlxsw: Trap ARP packets at layer 2 instead of layer 3

Next patch will set the same hardware domain for all bridge ports,
including VXLAN, to prevent packets from being forwarded by software when
they were already forwarded by hardware.

ARP packets are not flooded by hardware to VXLAN, so software should handle
such flooding. When hardware domain of VXLAN device will be changed, ARP
packets which are trapped and marked with offload_fwd_mark will not be
flooded to VXLAN also in software, which will break VXLAN traffic.

To prevent such breaking, trap ARP packets at layer 2 and don't mark them
as L2-forwarded in hardware, then flooding ARP packets will be done only
in software, and VXLAN will send ARP packets.

Remove NVE_ENCAP_ARP which is no longer needed, as now ARP packets are
trapped when they enter the device.

Signed-off-by: Amit Cohen <[email protected]>
Reviewed-by: Petr Machata <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
Signed-off-by: Petr Machata <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/b2a2cc607a1f4cb96c10bd3b0b0244ba3117fd2e.1742224300.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <[email protected]>

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