ARM: dts: exynos: Correct whitespace and indentation issues in Exynos5

Remove double space after '=' and fix indentation in Exynos5250,
Exynos5410 and Exynos5420 DTS files.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200901075417.22481-7-krzk@kernel.org