module: dvfs: fix get_opp_for_voltage

Merged Darryl Green requested to merge github/fork/vingu-linaro/fix-get-opp-voltage into master

Created by: vingu-linaro

get_opp_for_voltage() should use voltage instead of level where looking for an OPP.

Signed-off-by: Vincent Guittot vincent.guittot@linaro.org

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