[mac] enable wake-up frame periodic sniffing #491

Job	Run time
backbone-router	14m 26s
BR (mDNSResponder, TREL=0)	31m 52s
BR (mDNSResponder, TREL=1)	32m 11s
BR MATN (mDNSResponder, TREL=0)	19m 50s
BR LowPower (mDNSResponder, TREL=0)	9m 8s
BR nat64 (mDNSResponder, TREL=0)	25m 16s
BR (avahi, TREL=0)	31m 38s
BR (avahi, TREL=1)	32m 0s
BR core-firewall (avahi, TREL=0)	31m 51s
upload-coverage	52s
	3h 49m 4s

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