UPSTREAM: armv8 SHA-256 using ARMv8 Crypto Extensions

This patch adds support for the SHA-256 Secure Hash Algorithm for CPUs
that have support for the SHA-256 part of the ARM v8 Crypto Extensions.

UPSTREAM: armv8 SHA-256 using ARMv8 Crypto Extensions

This patch adds support for the SHA-256 Secure Hash Algorithm for CPUs
that have support for the SHA-256 part of the ARM v8 Crypto Extensions.

It greatly improves sha-256 based operations, about 17x faster on iMX8M
evk board. ~12ms vs ~208ms for a 20MiB kernel sha-256 verification.

asm implementation is a simplified version of the Linux version (from
Ard Biesheuvel).

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I653b755a29f2cb4e3c1290b02ad48de9d413b455
(cherry picked from commit 0fcc1c76d1acaa68a0675f0baa0e5d9a25908bae)

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