Merge "dm: Adding support of AES 256 bits in dm-req-crypt"

#define MAX_ENCRYPTION_BUFFERS 1

#define MIN_IOS 16

#define MIN_POOL_PAGES 32

#define KEY_SIZE_XTS 32

#define KEY_SIZE_XTS 64

#define AES_XTS_IV_LEN 16

#define DM_REQ_CRYPT_ERROR -1