Add bu and BackupRestoreConfirmation to the core build

The 'bu' program is used by the platform's local backup mechanism
to stream a 'tar'-compatible dump of application packages/data.

BackupRestoreConfirmation is the UI for verifying that the user
did is aware of & grants permission for a requested full backup or
restore operation.

Change-Id: I3a3fe345e89d09838bddc4010d429e1374e19440
diff --git a/target/product/core.mk b/target/product/core.mk
index a84e250..ae8a81b 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -25,6 +25,7 @@
 PRODUCT_PACKAGES := \
     apache-xml \
     bouncycastle \
+    bu \
     cacerts \
     com.android.location.provider \
     com.android.location.provider.xml \
@@ -64,6 +65,7 @@
     Home \
     HTMLViewer \
     ApplicationsProvider \
+    BackupRestoreConfirmation \
     ContactsProvider \
     DownloadProvider \
     DownloadProviderUi \