ARM: S3C64XX: Fix section mismatch from cpufreq init

The cpufreq init function is referenced from the driver structure and
we don't appear to have annotations which allow us to mark that it'll
never be called after system init, causing the linker consistency
infrastructure to complain. Just remove the __init annotation to avoid
noise from the build.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>