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DisplayContent: Remove unnecessary setRelativeLayer
This code is doing setRelativeLayer 1, relative to its own parent. This is equivalent to setLayer 1, but much more expensive in SurfaceFlinger. Fix it up as part of the dream of deprecating/removing setRelativeLayer. Bug: 214315611 Test: Existing tests pass Change-Id: I0c83180e5c56488a0dd8b97083578457f4be5256