dt-bindings: net: lan966x: Extend with the analyzer interrupt

Extend dt-bindings for lan966x with analyzer interrupt.
This interrupt can be generated for example when the HW learn/forgets
an entry in the MAC table.

Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>