submodule: bump openthread from `51ab865` to `90adc86` #1373

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Run time

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Job	Run time
pretty	41s
arm-gcc-4	8m 32s
arm-gcc-5	8m 33s
arm-gcc-6	8m 33s
arm-gcc-7	8m 34s
arm-gcc-9	9m 27s
	44m 20s