Mark LinkProperties as volatile

LinkProperties are populated on a different thread, so must be marked as
volatile.

Test: TH
Change-Id: I5fb98bf90aa0c3f420c3619a9d58cd82986cef7e
diff --git a/service/src/com/android/server/net/L2capNetwork.java b/service/src/com/android/server/net/L2capNetwork.java
index ca5f223..f274d8c 100644
--- a/service/src/com/android/server/net/L2capNetwork.java
+++ b/service/src/com/android/server/net/L2capNetwork.java
@@ -57,7 +57,7 @@
         @Nullable
         private IpClientManager mIpClient;
         @Nullable
-        private LinkProperties mLinkProperties;
+        private volatile LinkProperties mLinkProperties;
 
         L2capIpClient(String logTag, Context context, String ifname) {
             mLogTag = logTag;