[netif] remove multicast promiscuous mode configuration #33

Job	Run time
channel-manager-csl	12m 26s
packet-verification-low-power	9m 30s
expects	26m 59s
packet-verification-1-1-on-1-3	11m 4s
thread-1-3-gcc-m32	9m 58s
thread-1-3-posix	8m 39s
thread-1-3-gcc-m64	10m 36s
thread-1-3-clang-10-m32	10m 13s
thread-1-3-clang-10-m64	9m 46s
upload-coverage	0s
	1h 49m 11s

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