[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

service/Android.bp

@@ -66,6 +66,7 @@ java_library {
         "net-utils-device-common",
         "net-utils-framework-common",
         "netd-client",
+        "PlatformProperties",
     ],
     apex_available: [
         "//apex_available:platform",
@@ -76,7 +77,7 @@ java_library {
 java_library {
     name: "service-connectivity",
     installable: true,
-    static_libs:[
+    static_libs: [
         "service-connectivity-pre-jarjar",
     ],
     jarjar_rules: "jarjar-rules.txt",

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