arm64: dts: exynos: white-space cleanups

Fixup white-space issue:

  WARNING: please, no spaces at the start of a line

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210315124313.114842-3-krzysztof.kozlowski@canonical.com