ARM: S5PV310: Adds clkset_aclk for removing clkset_aclk_xxx

This patch adds 'clkset_aclk' to use commonly. And removed struct
clksrc_sources clkset_aclk_200, clkset_aclk_100, clkset_aclk_160,
and clkset_aclk_133.

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>