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spi_flash: remove useless dummy and make rom compatible on esp32s3(backport v4.3) See merge request espressif/esp-idf!12704
See the spi_flash.rst in the programming guide folder for more details. The docs above is for the new SPI Flash API above 4.0, for legacy implementation (CONFIG_SPI_FLASH_USE_LEGACY_IMPL enabled), read README_legayc.rst in the same folder with this readme.