ARM: dts: s5pv210: correct double "pins" in pinmux node

Drop second "pins" suffix from pin configuration/mux nodes.

Link: https://lore.kernel.org/r/20220926125824.477920-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>