arm:exynos:fix: Fix clock calculation for Exynos4210 based targets.

Provide proper setting for the APLL fout frequency calculation for
Exynos4 based targets (especially Exynos4210 - Trats board).

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Acked-by: Minkyu Kang <mk7.kang@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>