esp32/machine_i2s: Ensure 2 DMA buffers and improve I2S error handling.

ESP-IDF driver always requires at least two DMA buffers, so ensure that's
the case.

Failures during initialisation were being lost because ESP_ERROR_CHECK is
configured as a no-op, so the failure was deferred until read() or write()
was called on the port.  Raise an error from init, instead.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

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