drivers: ethernet: eth_adin2111: adjust multicast filter

Multicast rule as 01:00:00:00:00:00 is actually shadowing
broadcast rule, enabling broadcast packets to be received/forwarded
even if broadcast rule/filter is not set.

Set the multicast filter with an appropriate mask.

Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>