Over ride dun values for file encrypted bios only when 'set_dun' flag is set, file system is ext4 and content-encryption mode is FS_CRYPT_PRIVATE. Change-Id: I3340f29c71dbfb6006450415a718b661e49a6ed0 Signed-off-by: Neeraj Soni <neersoni@codeaurora.org>