Remove usage of hwcomposer_defs.h.

Remove the usage of hwcomposer_defs.h from SurfaceFlinger codebase,
convert usage of HWC_POWER_MODE_* to use IComposerClient::PowerMode
where the sematics of power mode is needed.

Bug: b/77585359
Test: atest libsurfaceflinger_unittest
Test: atest SurfaceFlinger_test
Test: atest libcompositionengine_test
Change-Id: I6c3a5d1b007329e4d9a32732d118365d6273670a