clk: samsung: exynos5433: Keep sclk_uart clocks enabled in suspend

All sclk_uart clocks in TOP CMU have to be kept enabled for suspend/resume
cycle, otherwise TM2(e) boards hangs before entering the suspend mode.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <snawrocki@kernel.org>