arm64: dts: exynos: Replace deprecated "gpios" i2c-gpio property in Exynos5433

"gpios" property is deprecated.  Update the Exynos5433 DTS to fix
dtbs_checks warnings like:

  arch/arm64/boot/dts/exynos/exynos5433-tm2.dt.yaml: i2c-gpio-0: 'sda-gpios' is a required property
  arch/arm64/boot/dts/exynos/exynos5433-tm2.dt.yaml: i2c-gpio-0: 'scl-gpios' is a required property

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Link: https://lore.kernel.org/r/20200829142501.31478-7-krzk@kernel.org