ARM: dts: exynos: align pin node names in Exynos4412

The DT schema expect pin configuration nodes to have pin prefix or
suffix:

  exynos4412-trats2.dtb: pinctrl@3860000: sleep-state: 'gpz-0', 'gpz-1', 'gpz-2', 'gpz-3', 'gpz-4', 'gpz-5', 'gpz-6'
    do not match any of the regexes: '^(pin-[a-z0-9-]+|[a-z0-9-]+-pin)$', 'pinctrl-[0-9]+'

Link: https://lore.kernel.org/r/20230120155404.323386-5-krzysztof.kozlowski@linaro.org


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