submodule: bump openthread from `fbb715b` to `20c9bcb` #1515

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Run time

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Job	Run time
pretty	32s
arm-gcc-4	8m 24s
arm-gcc-5	8m 20s
arm-gcc-6	8m 59s
arm-gcc-7	8m 21s
arm-gcc-9	9m 5s
	43m 41s