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/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index 83ee116..3c5ef78 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -106,6 +106,8 @@
     void restoreCheckpointPart(@utf8InCpp String device, int count);
     void markBootAttempt();
     boolean supportsCheckpoint();
+    boolean supportsBlockCheckpoint();
+    boolean supportsFileCheckpoint();
 
     @utf8InCpp String createStubVolume(@utf8InCpp String sourcePath,
             @utf8InCpp String mountPath, @utf8InCpp String fsType,