ARM: EXYNOS: Put PCM, Slimbus, Spdif clocks to off state

The clocks for PCM, Slimbus, Spdif added to off list in order
to turn them off at boot time.

Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
Acked-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>