clk: samsung: exynos5410: Add WDT, ACLK266 and SSS clocks

Add clock hierarchy for Security SubSystem clock and watchdog.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>