[netif] remove multicast promiscuous mode configuration #29

Job	Run time
backbone-router	14m 12s
BR (mDNSResponder, TREL=0)	30m 15s
BR (mDNSResponder, TREL=1)	30m 11s
BR MATN (mDNSResponder, TREL=0)	19m 8s
BR LowPower (mDNSResponder, TREL=0)	8m 17s
BR nat64 (mDNSResponder, TREL=0)	24m 3s
BR (avahi, TREL=0)	30m 3s
BR (avahi, TREL=1)	31m 7s
BR core-firewall (avahi, TREL=0)	30m 59s
upload-coverage	56s
	3h 39m 11s

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