Allow non datamedia devices to wipe encryption

With 5.0 L, we decrypt automatically if the default_password is
used. Non datamedia devices do not get the format data button so
they cannot wipe encryption off the device. This patch add a wipe
encryption button where the format data button would normally be
located on the Wipe page.

This patch also attempts to remove / delete the dm-crypt block
device before formatting.

Change-Id: I100d5d154d6c49254fd48e23279df973db5f23ae
diff --git a/crypto/lollipop/cryptfs.c b/crypto/lollipop/cryptfs.c
index c6586cc..496b960 100644
--- a/crypto/lollipop/cryptfs.c
+++ b/crypto/lollipop/cryptfs.c
@@ -725,7 +725,7 @@
   return retval;
 }
 
-static int delete_crypto_blk_dev(char *name)
+int delete_crypto_blk_dev(char *name)
 {
   int fd;
   char buffer[DM_CRYPT_BUF_SIZE];