Fix dumpDebugInfo blocked and phone hanging
HWC would be blocked in writing to pipe seldom due to pipe is full unless SurfaceFlinger read data from pipe. To prevent that, we use other thread to read data from pipe while HWC is writing. Bug: 248668158 Test: dumpsys pass Change-Id: Iae03fd36da657bfe8a6959b84479a1be9f182db9
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