Revert "SurfaceFlinger: Validate layers before casting."

This reverts commit 4293e9d75d5b0d033126f529ab61dd1f4a8d8420.

Reason for revert: it broke CtsViewTestCases:android.view.cts.ASurfaceControlTest

Bug: 129768960

Change-Id: I4b97869eefdf9108cf2e0e33656037780e5376f7
9 files changed