Move Android Keystore impl to android.security.keystore.

This moves the non-public API classes backing Android Keystore from
android.security to android.security.keystore, a package specially
created for Android Keystore.

Bug: 18088752
Change-Id: Ibf04d6a26c54d310b0501fc5e34f37b1176324ad
diff --git a/preloaded-classes b/preloaded-classes
index d2ed762..41a8857 100644
--- a/preloaded-classes
+++ b/preloaded-classes
@@ -1152,8 +1152,8 @@
 android.provider.Settings$System
 android.provider.Telephony$Mms
 android.renderscript.RenderScript
-android.security.AndroidKeyStoreBCWorkaroundProvider
-android.security.AndroidKeyStoreProvider
+android.security.keystore.AndroidKeyStoreBCWorkaroundProvider
+android.security.keystore.AndroidKeyStoreProvider
 android.speech.tts.TextToSpeechService
 android.speech.tts.TextToSpeechService$SpeechItemV1
 android.speech.tts.TextToSpeechService$SynthesisSpeechItemV1