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/Checkpoint.h b/Checkpoint.h
index 70dad8a..d077d19 100644
--- a/Checkpoint.h
+++ b/Checkpoint.h
@@ -25,6 +25,10 @@
 
 android::binder::Status cp_supportsCheckpoint(bool& result);
 
+android::binder::Status cp_supportsBlockCheckpoint(bool& result);
+
+android::binder::Status cp_supportsFileCheckpoint(bool& result);
+
 android::binder::Status cp_startCheckpoint(int retry);
 
 android::binder::Status cp_commitChanges();