Use the correct frame rate vote for metrics

Applications using preferredDisplayModeId to request a frame rate will
have their vote recorded on the task SurfaceControl, so the entire layer
tree vote needs to be used.

Bug: 284866750
Test: builds
Test: test app setting preferredDisplayModeId
Change-Id: I04c575e58b842bebf5f79d86ec7ab7e738079886