[mac] enable wake-up frame periodic sniffing #27

Job	Run time
channel-manager-csl	3m 27s
packet-verification-1-1-on-1-4	12m 18s
packet-verification-low-power	10m 24s
thread-1-4-gcc-m32	8m 13s
expects	20m 2s
thread-1-4-posix	9m 59s
thread-1-4-gcc-m64	8m 31s
thread-1-4-clang-10-m32	7m 56s
thread-1-4-clang-10-m64	7m 16s
upload-coverage	0s
	1h 28m 6s

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