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esp32/machine_hw_spi: Set proper default SPI(id=2) pins on S2 and S3.
Use IO_MUX pins as defined by ESP IDF in soc/esp32/include/soc/spi_pins.h ESP32S2 and S3 don't have IO_MUX pins for SPI3, GPIO matrix is always used. Choose suitable defaults for S2 and S3. ESP32C3 does not have SPI3 at all. Don't define pin mappings for it. Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
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