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Add section on power considerations

Harry Wentland requested to merge hwentland/color-and-hdr:power into main

HDR increases the memory bandwidth requirements, as well as GPU usage for desktop composition. In order to do HDR on mobile platforms without draining the battery quickly we need to use the HW in ways that allow us to conserve as much power as possible, while maintaining the fidelity of our color managed desktop.

Power optimizations are usually a trade-off between power and SW/HW complexity. This doc is attempting to provide a guide, highlighting the areas where we can expect large power savings and a rough draft on how to attain these power savings. The primary use-case this is being addressed in this doc is the video playback case.

This doc also touches on the gaming use-case, which is more about latency and performance, than power. I left it in because optimizing this use-case is otherwise very similar to the recommended steps for power savings.

This MR attempts to partially address the questions raised in #6

Edited by Harry Wentland

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