dt-bindings: gpio: convert faraday,ftgpio01 to yaml

Converts gpio/faraday,ftgpio010.txt to yaml.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>