Revert "Make system property reads wait-free"

This reverts commit 0cf90556de2bde53a1957c5946036b2fe2e4e429.

Reason for revert: Device boot failures - 144355953

Change-Id: Icd4fc8c7a1d06d688a6d37e6f1c1aa45563f711b
diff --git a/benchmarks/property_benchmark.cpp b/benchmarks/property_benchmark.cpp
index ba54ed1..77814bf 100644
--- a/benchmarks/property_benchmark.cpp
+++ b/benchmarks/property_benchmark.cpp
@@ -184,7 +184,7 @@
 
   size_t i = 0;
   while (state.KeepRunning()) {
-    __system_property_serial(pinfo[i]);
+    pa.system_properties().Serial(pinfo[i]);
     i = (i + 1) % nprops;
   }