Mark as opp-suspend required devfreq Operating Performance Points to
fix resuming issues on Exynos 4 boards.

The patch is based on earlier work by Tobias Jakobi.
Suggested-by: NTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Suggested-by: NChanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: NChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: NLukasz Luba <l.luba@partner.samsung.com>
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>