Support File Based Encryption

Change-Id: Ib688ddd0c32d3999590cacd86b6d9b18eac336e9
diff --git a/variables.h b/variables.h
index 241c7dc..5c9b40e 100644
--- a/variables.h
+++ b/variables.h
@@ -132,6 +132,7 @@
 #define TW_IS_DECRYPTED             "tw_is_decrypted"
 #define TW_CRYPTO_PWTYPE            "tw_crypto_pwtype"
 #define TW_HAS_CRYPTO               "tw_has_crypto"
+#define TW_IS_FBE                   "tw_is_fbe"
 #define TW_CRYPTO_PASSWORD          "tw_crypto_password"
 #define TW_SDEXT_DISABLE_EXT4       "tw_sdext_disable_ext4"
 #define TW_MILITARY_TIME            "tw_military_time"