Move registration into android package

Mutator registration is tightly coupled with the android package, move
all registration from the soong package to the android package.

Test: build.ninja identical
Change-Id: I0326d0c88f78edb79eebedb155b69415e351fb61
diff --git a/build/art.go b/build/art.go
index b826538..1164cbc 100644
--- a/build/art.go
+++ b/build/art.go
@@ -15,7 +15,6 @@
 package art
 
 import (
-	"android/soong"
 	"android/soong/android"
 	"android/soong/cc"
 	"fmt"
@@ -222,13 +221,13 @@
 var artTestMutex sync.Mutex
 
 func init() {
-	soong.RegisterModuleType("art_cc_library", artLibrary)
-	soong.RegisterModuleType("art_cc_binary", artBinary)
-	soong.RegisterModuleType("art_cc_test", artTest)
-	soong.RegisterModuleType("art_cc_test_library", artTestLibrary)
-	soong.RegisterModuleType("art_cc_defaults", artDefaultsFactory)
-	soong.RegisterModuleType("art_global_defaults", artGlobalDefaultsFactory)
-	soong.RegisterModuleType("art_debug_defaults", artDebugDefaultsFactory)
+	android.RegisterModuleType("art_cc_library", artLibrary)
+	android.RegisterModuleType("art_cc_binary", artBinary)
+	android.RegisterModuleType("art_cc_test", artTest)
+	android.RegisterModuleType("art_cc_test_library", artTestLibrary)
+	android.RegisterModuleType("art_cc_defaults", artDefaultsFactory)
+	android.RegisterModuleType("art_global_defaults", artGlobalDefaultsFactory)
+	android.RegisterModuleType("art_debug_defaults", artDebugDefaultsFactory)
 }
 
 func artGlobalDefaultsFactory() (blueprint.Module, []interface{}) {