net/mlx5e: Allow setting MAC address of representors

A representor netdev does not correspond to real hardware that needs to
be updated when setting the MAC address. The default eth_mac_addr() is
sufficient for simply updating the netdev's MAC address with validation.

Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/1747898036-1121904-1-git-send-email-tariqt@nvidia.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>