msm8916-common: Force disable display partial updates

Postprocessing daemon (ppd) will only work when partial
updates is in a disabled state.
Logic for checking dynamic partial updates state via
the sysfs node (/sys/class/graphics/fb0/dyn_pu) seems
to be broken in ppd as it keeps polling and causing
100% cpu utilization:

openat(AT_FDCWD, "/sys/class/graphics/fb0/dyn_pu", O_RDONLY) = 6
ppoll([{fd=4096, events=0}, {fd=6, events=POLLPRI|POLLERR}], 2, NULL, NULL, 0) = 1 ([{fd=0, revents=POLLIN}])
ppoll([{fd=4096, events=0}, {fd=6, events=POLLPRI|POLLERR}], 2, NULL, NULL, 0) = 1 ([{fd=0, revents=POLLIN}])
ppoll([{fd=4096, events=0}, {fd=6, events=POLLPRI|POLLERR}], 2, NULL, NULL, 0) = 1 ([{fd=0, revents=POLLIN}])

For now, we will disable partial updates until the
poll loop is solved.

Change-Id: I0616d5dca816213274eeea5746c48973e6d770c5

Author: niclimcy

Diff for: system_prop.mk

@@ -31,7 +31,8 @@ PRODUCT_PROPERTY_OVERRIDES += \
     debug.sf.disable_backpressure=1 \
     debug.sf.latch_unsignaled=1 \
     persist.hwc.mdpcomp.enable=true \
-    persist.hwc.ptor.enable=true
+    persist.hwc.ptor.enable=true \
+    persist.hwc.pubypass=true
 
 # Media
 PRODUCT_PROPERTY_OVERRIDES += \