ARM: dts: exynos: Replace deprecated GPIO spi-gpio properties in Universal C210

"gpio-sck" and "gpio-mosi" are deprecated so update the DTS to fix
dtbs_checks warnings like:

  arch/arm/boot/dts/exynos4210-universal_c210.dt.yaml: spi-lcd:
    gpio-sck: False schema does not allow [[85, 1, 0]]

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20200830135200.24304-14-krzk@kernel.org