crypto: caam - ARRAY_SIZE() vs sizeof()

ARRAY_SIZE() was intended here instead of sizeof().  sizeof() is four
times larger than ARRAY_SIZE().  outstr is normally 256 chars so
printing garbage to it could overfill the buffer and corrupt memory.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>