Don't refer to DeviceIdle from SystemServiceRegistry

In preparation of mainline.

Test: atest cts/tests/tests/batterysaving/src/android/os/cts/deviceidle/DeviceIdleTest.java
Bug: 137763703

Change-Id: Id3088ba65682722ff4c2808bdc86a0ade18a4ab5
diff --git a/config/preloaded-classes b/config/preloaded-classes
index ea50999..778a4d7 100644
--- a/config/preloaded-classes
+++ b/config/preloaded-classes
@@ -200,6 +200,7 @@
 android.app.ContextImpl$1
 android.app.ContextImpl$ApplicationContentResolver
 android.app.ContextImpl
+android.app.DeviceIdleFrameworkInitializer
 android.app.DexLoadReporter
 android.app.Dialog$ListenersHandler
 android.app.Dialog