Make checkpointing work on ext4

Test: All tests pass
Change-Id: I2a6cdf1edfe752f4633e1931e75d18659653938c
diff --git a/VoldNativeService.cpp b/VoldNativeService.cpp
index 582f84e..41250c7 100644
--- a/VoldNativeService.cpp
+++ b/VoldNativeService.cpp
@@ -799,6 +799,16 @@
     return ok();
 }
 
+binder::Status VoldNativeService::restoreCheckpoint(const std::string& mountPoint,
+                                                    bool* _aidl_return) {
+    ENFORCE_UID(AID_SYSTEM);
+    CHECK_ARGUMENT_PATH(mountPoint);
+    ACQUIRE_LOCK;
+
+    *_aidl_return = cp_restoreCheckpoint(mountPoint);
+    return ok();
+}
+
 binder::Status VoldNativeService::markBootAttempt(bool* _aidl_return) {
     ENFORCE_UID(AID_SYSTEM);
     ACQUIRE_LOCK;