crypto: atmel-aes - fix compiler error when VERBOSE_DEBUG is defined

This patch fixes a compiler error when VERBOSE_DEBUG is defined. Indeed,
in atmel_aes_write(), the 3rd argument of atmel_aes_reg_name() was
missing.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Reported-by: Levent Demir <levent.demir@inria.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>