crypto: mv_cesa - Add missing #define

Clearly this was meant to be an include guard, but the #define was
missing.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/mv_cesa.h

 #ifndef __MV_CRYPTO_H__
+#define __MV_CRYPTO_H__
 
 #define DIGEST_INITIAL_VAL_A	0xdd00
 #define DIGEST_INITIAL_VAL_B	0xdd04