dvfs: Add initial Unit Test
Created by: khaledAhmed-arm
Add unit tests for function helpers of dvfs.
Change-Id: I7285d13fd77732e7f7658ee2e8db7bc1897dd027
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Created by: khaledAhmed-arm
Add unit tests for function helpers of dvfs.
Change-Id: I7285d13fd77732e7f7658ee2e8db7bc1897dd027