[mac] enable wake-up frame periodic sniffing #40

Job	Run time
channel-manager-csl	3m 32s
expects	31m 15s
packet-verification-1-1-on-1-4	12m 47s
packet-verification-low-power	10m 17s
thread-1-4-gcc-m32	12m 2s
thread-1-4-posix	9m 55s
thread-1-4-gcc-m64	11m 24s
thread-1-4-clang-10-m32	11m 19s
thread-1-4-clang-10-m64	10m 57s
upload-coverage	20s
	1h 53m 48s

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