Limit cyclic refresh on steady background blocks.
Use the existing QP condition on limiting cyclic refresh, and add addiitonal condition that block has been encoded with zero/small motion x frames in row (where x is at least several times the refresh period). Additional condition only affect non-screen content mode. This helps to improve visual stability for noisy input, where on steady background areas the application of delta_qp may lead to encoding the noise. Also added a change to use the true skip (after encoding) to update the last QP. Change-Id: I234a1128d017d284cf767fdb58ef6c59d809f679
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