[netif] remove multicast promiscuous mode configuration #31

Job	Run time
backbone-router	18m 24s
BR (mDNSResponder, TREL=0)	32m 42s
BR (mDNSResponder, TREL=1)	34m 6s
BR MATN (mDNSResponder, TREL=0)	1m 37s
BR LowPower (mDNSResponder, TREL=0)	13m 56s
BR nat64 (mDNSResponder, TREL=0)	4m 36s
BR (avahi, TREL=0)	4m 7s
BR (avahi, TREL=1)	5m 36s
BR core-firewall (avahi, TREL=0)	34m 10s
upload-coverage	0s
	2h 29m 14s

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