Revert "SurfaceFlinger: add a sysprop for GL backpressure"

This reverts commit 4658e11cbe1abae691454ddcf93a06763d1bf828.

Reason for revert: Seems to be responsible for breaking git_stage-aosp-master on aosp_arm64-eng, see b/140906153

Change-Id: I8968ca1bf95988b453bc33cd78a6389d6cb38a4f
2 files changed