Add vdc checkpoint supportsBlockCheckpoint

Also add vdc checkpoint supportsFileCheckpoint
This is to allow tests to be specific to supported checkpoint mode.

Test: Built on Taimen and Crosshatch, made sure both new functions work
as expected

Change-Id: I0eab7453b13c0a2e31840ef9ad24a692cec55b00
diff --git a/VoldNativeService.h b/VoldNativeService.h
index 954b8ae..8fbc32d 100644
--- a/VoldNativeService.h
+++ b/VoldNativeService.h
@@ -131,6 +131,8 @@
     binder::Status markBootAttempt();
     binder::Status abortChanges();
     binder::Status supportsCheckpoint(bool* _aidl_return);
+    binder::Status supportsBlockCheckpoint(bool* _aidl_return);
+    binder::Status supportsFileCheckpoint(bool* _aidl_return);
 };
 
 }  // namespace vold