ESP32: Fix compilation of I2S in Arduino ESP32 core 1.0.6 #565
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The last contribution broke compilation on IDF <4.4.0. This is a problem as the library now no longer compiles on ESP32 core 1.0.6, the most stable version.
AudioOutputI2S.cpp & AudioOutputSPDIF.cpp do'n't compile because of unknown mck_io_num, mclk_multiple, bits_per_chan, I2S_MCLK_MULTIPLE_DEFAULT and I2S_BITS_PER_CHAN_DEFAULT.
This PR fixes the compilation problem.