Add Backup/Restore sample to the SDK docs

Part of bug #2545514

Change-Id: I235d33b839924d4bc574fd1e6762d169902e1c8b
diff --git a/Android.mk b/Android.mk
index 5a4c547..cecc26a 100644
--- a/Android.mk
+++ b/Android.mk
@@ -381,6 +381,8 @@
 		-hdf android.hasSamples 1 \
 		-samplecode $(sample_dir)/ApiDemos \
 		            resources/samples/ApiDemos "API Demos" \
+		-samplecode $(sample_dir)/BackupRestore \
+		            resources/samples/BackupRestore "Backup and Restore" \
 		-samplecode $(sample_dir)/BluetoothChat \
 		            resources/samples/BluetoothChat "Bluetooth Chat" \
 		-samplecode $(sample_dir)/BusinessCard \