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Common spi functionality for sharing the SPI bus between modules is moved from esp_driver_spi to a more fitting location in esp_hw_support (shared HW resource control). This also allows us to decouple the spi_flash driver from esp_driver_spi, removing esp_driver_spi and esp_ringbuf from G1 builds.
See the spi_flash.rst in the programming guide folder for more details.