boards: xtensa: esp32s2_franzininho: add support

to the ESP32 S2 Franzininho educational development
board.

Signed-off-by: Felipe Neves <felipe.neves@linaro.org>

boards: xtensa: esp32s2_franzininho: remove docs

section for debugging since this board does not have
any on board debug or connection for that.

Signed-off-by: Felipe Neves <felipe.neves@linaro.org>