submodule: bump openthread from `db63932` to `bb5e9b7` #1579

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Run time

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Job	Run time
pretty	27s
arm-gcc-4	8m 35s
arm-gcc-5	8m 39s
arm-gcc-6	8m 37s
arm-gcc-7	9m 20s
arm-gcc-9	8m 49s
	44m 27s