[mac] enable wake-up frame periodic sniffing #30

Job	Run time
channel-manager-csl	3m 22s
expects	19m 40s
packet-verification-1-1-on-1-4	12m 31s
packet-verification-low-power	10m 31s
thread-1-4-gcc-m32	8m 43s
thread-1-4-gcc-m64	8m 11s
thread-1-4-clang-10-m32	1m 42s
thread-1-4-clang-10-m64	1m 21s
thread-1-4-posix	9m 44s
upload-coverage	0s
	1h 15m 45s

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