Support for spotpear 1.69 esp32c3 device #10106
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This adds a target for an ESP32C3 device with an SPI ST7789 display, an external 16MB flash, buzzer, user programmable button, lithium charge circuit and a UART broken out to an unpopulated GPIO header.
The device also has an I2C CST8xx touch device, but it is not usable unless #10100 is actioned, as the SDA line is on GPIO11, which is usually reserved as "VDD_SPI" but, since this device has external flash, and has had the BLOCK0 VDD_SPI_AS_GPIO efuse burnt, there is no technical reason it cannot be used, just a programmatic one.