Make mainline IKE statically include Android StateMachine

This commit adds Android StateMachine source files to the
filegroup that is statically included in mainline IKE.

Bug: 146457741
Test: build, flash, boot
Test: atest FrameworksIkeTests
Change-Id: I2549299350090ae02e9ccc965663aeb2b311c6d8

Android.bp

@@ -591,6 +591,9 @@ filegroup {
     visibility: ["//frameworks/opt/net/ike"],
     srcs: [
         "core/java/android/net/annotations/PolicyDirection.java",
+        "core/java/com/android/internal/util/IState.java",
+        "core/java/com/android/internal/util/State.java",
+        "core/java/com/android/internal/util/StateMachine.java",
         "telephony/java/android/telephony/Annotation.java",
     ],
 }