sm6150-common: Disable EGL image tracking

This is a surfaceflinger debugging feature that we don't care about, so
disable it to reduce overhead.

Change-Id: Iaf6417d101f1a79bfadf85f779a614ed0460c56d

vendor.prop

@@ -137,7 +137,6 @@ debug.sf.early.sf.duration=21000000
 debug.sf.early.app.duration=16500000
 debug.sf.earlyGl.sf.duration=13500000
 debug.sf.earlyGl.app.duration=21000000
-debug.sf.enable_egl_image_tracker=1
 debug.sf.enable_hwc_vds=1
 debug.sf.hw=0
 debug.sf.predict_hwc_composition_strategy=0