submodule: bump openthread from `3a28b7b` to `e120051` (#906) #1756

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Run time

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Job	Run time
pretty	25s
arm-gcc-4	15m 41s
arm-gcc-5	15m 37s
arm-gcc-6	15m 42s
arm-gcc-7	16m 14s
arm-gcc-9	16m 41s
	1h 20m 20s