ARM: dts: exynos: correct HS200 property in Exynos5260

There is no supports-hs200-mode property for MMC nodes, so assume
intention was mmc-hs200-1_8v:

  exynos5260-xyref5260.dtb: mmc@12140000: Unevaluated properties are not allowed ('supports-hs200-mode' was unexpected)

Link: https://lore.kernel.org/r/20230120155404.323386-11-krzysztof.kozlowski@linaro.org


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