Use hyphens instead of underscores in the Exynos4210 and Exynos4412 node names which is expected by naming convention, multiple dtschema files and pointed out by dtc W=2 builds. Use also generic "ppmu" node name for PPMU nodes to match Devicetree specification. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20201105184506.215648-2-krzk@kernel.org