clk: samsung: clkout: Add support for Exynos5410

Add compatible for Exynos5410 so the PMU on this SoC would provide
CLKOUT.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>