AP_HAL_ChibiOS: add support for CAN_MCAST in CubeRedPrimary

[bugobliterator]

enables support for CAN Multicast operation on CubeRedPrimary, its been tested working.

[rbeall]

Baseline test using CAN1 on CubeRed
param set NET_OPTIONS 10

@bugobliterator
multicast traffic now on network and dronecan_gui_tool now connecting. However, node discovery keeps having issues where nodes are dropped and rediscovered every 6 seconds or so. Toggle Bit errors etc

@tridge this was the problem with the CubeRed not bridging I was telling you about. Ended up not being my default path or static routes. I can see the traffic now, but something on the bridge side or the drone_can_gui tool isn't working. This is also using ethernet cables so shouldn't have any link reliability issues being the culprit I'd think

[rbeall]