vold: Add an optional wipe paramter to the volume format command

The new wipe option to the vold format command will invoke BLKDISCARD
on the partition before invoking newfs_msdos.  This will be used whenever
a full wipe of the device is wanted, as this is more secure than just
doing newfs_msdos.

Bug: 9392982
Change-Id: Ie106f1b9cc70abc61206006d1821641c27c7ccae
diff --git a/VolumeManager.h b/VolumeManager.h
index 198b5a9..be78516 100644
--- a/VolumeManager.h
+++ b/VolumeManager.h
@@ -83,7 +83,7 @@
     int shareVolume(const char *label, const char *method);
     int unshareVolume(const char *label, const char *method);
     int shareEnabled(const char *path, const char *method, bool *enabled);
-    int formatVolume(const char *label);
+    int formatVolume(const char *label, bool wipe);
     void disableVolumeManager(void) { mVolManagerDisabled = 1; }
 
     /* ASEC */