Support extended range fp16 ClientTargets in HWC
Introduce the concept of hdrSdrRatio for ClientTargets, so that: * 1.0 is treated as SDR luminance * hdrSdrRatio is provided to scale the content into display luminance range during composition. That is, 1.0 maps to SDR max, and hdrSdrRatio maps to display max luminance Bug: 236745178 Test: builds Change-Id: Id82a102eaca82f85bf3982538786dd2ae6cb8e61
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