Constant esp_idf_svc::sys::emac_rmii_clock_gpio_t_EMAC_CLK_IN_GPIO

pub const emac_rmii_clock_gpio_t_EMAC_CLK_IN_GPIO: u32 = 0; // 0u32

@brief MAC will get RMII clock from outside at this GPIO.

@note ESP32 only supports GPIO0 to input the RMII clock.