ext4 crypto: add ext4 encryption Kconfig

	  If you are not using a security module that requires using

	  extended attributes for file security labels, say N.

config EXT4_FS_ENCRYPTION

	bool "Ext4 Encryption"

	depends on EXT4_FS

	select CRYPTO_AES

	select CRYPTO_CBC

	select CRYPTO_ECB

	select CRYPTO_XTS

	select CRYPTO_CTS

	select CRYPTO_SHA256

	select KEYS

	select ENCRYPTED_KEYS

	help

	  Enable encryption of ext4 files and directories.  This

	  feature is similar to ecryptfs, but it is more memory

	  efficient since it avoids caching the encrypted and

	  decrypted pages in the page cache.

config EXT4_DEBUG

	bool "EXT4 debugging support"

	depends on EXT4_FS