ARM: S5PV210: Add audio clocks as sysclk

This patch adds audio clocks(SCLK_AUDIO{0,1,2} and SCLK_AUDIO) to be
initial as a sysclk on boot-time.

Signed-off-by: Seungwhan Youn <sw.youn@samsung.com>
Acked-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>