SF: Use getVisibleLayers... in doComposeSurfaces

in b/114101122, it is discovered that there is a problem
in indexing the SF mCompositionInfo by displayId because
there are multiple displays that have the same id (-1).

This change uses getVisibleLayersSortedByZ in doComposeSurfaces
until we can fix the indexing of mCompositionInfo.

Bug: 114101122
Test: run cts -m CtsViewTestCases, CtsMediaTestCases

Change-Id: I90adb957c183400c396f25fa9583b668e1da8417