Bump third_party/ot-br-posix/repo from `bd15f71` to `b041fa5` #2387

Job	Run time
Build on Linux (fake, gcc_release, clang, simulated)	2h 10m 29s
Build on Darwin (clang, python_lib, simulated)	2h 5m 28s
Build on Linux (gcc_debug)	1h 13m 48s
Build on Linux (coverage)	16m 23s
Build on Linux (python_lib)	32m 25s
Build on Linux (python lighting-app)	10m 49s
	6h 29m 22s

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