Move ActionParser to its own file

Bug: 36970783
Test: build
Change-Id: Idd5b923e4789760bb9ef67c10982b2642bc6a31a
diff --git a/init/Android.bp b/init/Android.bp
index 6c80ee6..e218d2a 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -93,6 +93,7 @@
     defaults: ["init_defaults"],
     srcs: [
         "action.cpp",
+        "action_parser.cpp",
         "bootchart.cpp",
         "builtins.cpp",
         "capabilities.cpp",