This patch prepares the PMU code for the future:
- suspend/resume (S2R) support
- cpuidle AFTR/W-AFTR modes support
on Exynos3250.

Cc: Vikas Sajjan <vikas.sajjan@samsung.com>
Reviewed-by: NPankaj Dubey <pankaj.dubey@samsung.com>
Acked-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
[kgene.kim@samsung.com: fixed coding style]
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>