[mac] enable wake-up frame periodic sniffing #506

Job	Run time
backbone-router	14m 14s
BR (mDNSResponder, TREL=0)	32m 38s
BR (mDNSResponder, TREL=1)	33m 17s
BR MATN (mDNSResponder, TREL=0)	19m 57s
BR LowPower (mDNSResponder, TREL=0)	9m 6s
BR nat64 (mDNSResponder, TREL=0)	24m 36s
BR (avahi, TREL=0)	32m 54s
BR (avahi, TREL=1)	33m 4s
BR core-firewall (avahi, TREL=0)	33m 8s
upload-coverage	1m 4s
	3h 53m 58s

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