The PMU (Power Management Unit) driver is a clkout clock provider (for
clock signal monitoring) only for certain Exynos SoCs. It was never
implemented for Exynos5260 and Exynos7. This fixes dtschema validator
warnings like:
system-controller@105c0000: '#clock-cells' is a required property
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>