IpConfigStoreTest: increase timeout for waitForIdle

waitForIdle in readIpConfigurationFromFilePath times out.

Test: TH
Change-Id: I5bc8c5b4678b984ec6406d85725297a63faeaabf
diff --git a/tests/unit/java/com/android/server/net/IpConfigStoreTest.java b/tests/unit/java/com/android/server/net/IpConfigStoreTest.java
index 4adc999..19ded24 100644
--- a/tests/unit/java/com/android/server/net/IpConfigStoreTest.java
+++ b/tests/unit/java/com/android/server/net/IpConfigStoreTest.java
@@ -58,7 +58,7 @@
 @RunWith(DevSdkIgnoreRunner.class)
 @DevSdkIgnoreRule.IgnoreUpTo(Build.VERSION_CODES.S_V2)
 public class IpConfigStoreTest {
-    private static final int TIMEOUT_MS = 2_000;
+    private static final int TIMEOUT_MS = 5_000;
     private static final int KEY_CONFIG = 17;
     private static final String IFACE_1 = "eth0";
     private static final String IFACE_2 = "eth1";