dt-bindings: gpio: gpio-delay: Spelling s/curcuit/circuit/

Fix misspellings of "circuit".

Fixes: c7239a3d ("dt-bindings: gpio: Add gpio-delay binding document")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>