create library for mainline module

This library is a temporary work to link all mainline module using
statemachine.
Once this is done, we will be able to move the library to
frameworks/libs/modules-utils

also fix some typo in state* files

Cherry picked from aosp/1818896

Bug: 198418216
Tag: #refactor
Test: None
Merged-In: I1bec7c7bdb25bf3397a742a356aa1f18fddf7d89
Change-Id: I1bec7c7bdb25bf3397a742a356aa1f18fddf7d89

core/java/Android.bp

@@ -359,6 +359,27 @@ filegroup {
     ],
 }
 
+java_library {
+    name: "modules-utils-statemachine",
+    srcs: [
+        "com/android/internal/util/IState.java",
+        "com/android/internal/util/State.java",
+        "com/android/internal/util/StateMachine.java",
+    ],
+    libs: [
+        "framework-annotations-lib",
+        "unsupportedappusage",
+    ],
+    sdk_version: "module_current",
+    min_sdk_version: "29",
+
+    visibility: ["//visibility:public"],
+    apex_available: [
+        "//apex_available:anyapex",
+        "//apex_available:platform",
+    ],
+}
+
 filegroup {
     name: "framework-ims-common-shared-srcs",
     srcs: [