arm64: dts: exynos8895: add a node for mmc

arm64: dts: exynos8895: add a node for mmc

Add an MMC node in order to allow devices with that SoC to make use of
it. It's typically used as a secondary storage option for SD cards. In
the vendor kernels, it's labelled as mmc_2, but since there don't seem to
be any other blocks, treat it as the only MMC.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Link: https://lore.kernel.org/r/20250105161344.420749-5-ivo.ivanov.ivanov1@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>