ext4.h: add EXT4_FEATURE_INCOMPAT_ENCRYPT

fs_mgr needs to know the value of the encrypt feature flag (added to
ext4 in upstream kernel v4.1) so it can enable it.

Bug: 36231741
Change-Id: I7475ea8424fa5a2c4712634eada3095e938e97e3
diff --git a/ext4_utils/include/ext4_utils/ext4.h b/ext4_utils/include/ext4_utils/ext4.h
index 219737e..6cc8f02 100644
--- a/ext4_utils/include/ext4_utils/ext4.h
+++ b/ext4_utils/include/ext4_utils/ext4.h
@@ -508,6 +508,7 @@
 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400  
 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000  
+#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
 
 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE|   EXT4_FEATURE_INCOMPAT_RECOVER|   EXT4_FEATURE_INCOMPAT_META_BG|   EXT4_FEATURE_INCOMPAT_EXTENTS|   EXT4_FEATURE_INCOMPAT_64BIT|   EXT4_FEATURE_INCOMPAT_FLEX_BG)