msm8953-common: Disable debug.sf.latch_unsignaled

Apparently, it introduces dramatical performance degradation in some use cases.

Change-Id: I92aaa4469f6848e4dfff89f3781f31ed527bae2b

prop.mk

@@ -73,7 +73,6 @@ debug.gralloc.enable_fb_ubwc=1 \
 debug.mdpcomp.logs=0 \
 debug.sf.enable_hwc_vds=1 \
 debug.sf.hw=0 \
-debug.sf.latch_unsignaled=1 \
 debug.sf.recomputecrop=0 \
 dev.pm.dyn_samplingrate=1 \
 persist.debug.wfd.enable=1 \