Togging ALLMULTI does not require controller reset so have Rx filtering handle this. Introduce a new function msk_rxfilter that handles Rx filter configuration and multicast setup as well as promiscuous mode. This simplifies code a lot. Promiscuous mode always have preference to any other Rx filtering so don't disable the mode when ALLMULTI is set.
Togging ALLMULTI does not require controller reset so have Rx
filtering handle this. Introduce a new function msk_rxfilter that
handles Rx filter configuration and multicast setup as well as
promiscuous mode. This simplifies code a lot.
Promiscuous mode always have preference to any other Rx
filtering so don't disable the mode when ALLMULTI is set.

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