crypto: ux500 - Add driver for HASH hardware

This adds a driver for the ST-Ericsson ux500 hash hardware
module. The driver implements support for SHA-1 and SHA-2.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andreas Westin <andreas.westin@stericsson.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>