Binder: abstract report_sysprop_change to OS layer

Bug: 302723053
Test: mma
Change-Id: Ia479cbf435eeba108cf21e6adddf2d1034174019
diff --git a/libs/binder/OS.h b/libs/binder/OS.h
index db4b7a5..8dc1f6a 100644
--- a/libs/binder/OS.h
+++ b/libs/binder/OS.h
@@ -43,4 +43,6 @@
 
 uint64_t GetThreadId();
 
+bool report_sysprop_change();
+
 } // namespace android::binder::os