Separate multicast filtering of SysKonnect GENESIS and Marvell

Yukon from common multicast handling code. Yukon uses hash-based
multicast filtering(big endian form) but GENESIS uses perfect
multicast filtering as well as hash-based one(little endian form).
Due to the differences of multicast filtering there is no much
sense to have a common code.
 o Remove sk_setmulti() and introduce sk_rxfilter_yukon(),
   sk_rxfilter_yukon() that handles multicast filtering setup.
 o Have sk_rxfilter_{yukon, genesis} handle promiscuous mode and
   nuke sk_setpromisc(). This simplifies ioctl handler as well as
   giving a chance to check validity of Rx control register of
   Yukon.
 o Don't reinitialize controller when IFF_ALLMULTI flags is changed.
 o Nuke sk_gmchash(), it's not needed anymore.
 o Always reconfigure Rx control register whenever a new multicast
   filtering condition is changed. This fixes multicast filtering
   setup on Yukon.

PR:	kern/134051

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