Add API to IMountService to get encryption state

Bug: 18002358
Change-Id: If7d9c9a5ed38ac37849fcf638ec10c76d2f419a1
diff --git a/services/core/java/com/android/server/DiskStatsService.java b/services/core/java/com/android/server/DiskStatsService.java
index 9313148..8ca675a 100644
--- a/services/core/java/com/android/server/DiskStatsService.java
+++ b/services/core/java/com/android/server/DiskStatsService.java
@@ -80,7 +80,7 @@
         reportFreeSpace(Environment.getDownloadCacheDirectory(), "Cache", pw);
         reportFreeSpace(new File("/system"), "System", pw);
 
-        if (StorageManager.isNativeFileBasedEncryptionEnabled()) {
+        if (StorageManager.isFileEncryptedNativeOnly()) {
             pw.println("File-based Encryption: true");
         }