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/Android.mk b/Android.mk
index 098c3d0..71113df 100644
--- a/Android.mk
+++ b/Android.mk
@@ -15,6 +15,7 @@
 	Devmapper.cpp \
 	ResponseCode.cpp \
 	Xwarp.cpp \
+	VoldUtil.c \
 	fstrim.c \
 	cryptfs.c