[CS15]Do not use hidden API of PlatformProperties

ConnectivityService is going to become a mainline module, and
it will not able to use hidden method anymore. Using PlatformProperties
as a static library instead of hidden API.

Bug: 170917042
Test: atest FrameworksNetTests
Merged-In: I3a3deca5d2e0f690db8c0061de2db2217376d268
Change-Id: I3a3deca5d2e0f690db8c0061de2db2217376d268
diff --git a/service/jarjar-rules.txt b/service/jarjar-rules.txt
index d8c60a4..a7b419b 100644
--- a/service/jarjar-rules.txt
+++ b/service/jarjar-rules.txt
@@ -1,3 +1,4 @@
+rule android.sysprop.** com.android.connectivity.sysprop.@1
 rule com.android.net.module.util.** com.android.connectivity.net-utils.@1
 rule com.android.modules.utils.** com.android.connectivity.modules-utils.@1