BACKPORT: crypto: arm - add support for SHA-224/256 using ARMv8 Crypto Extensions

This implements the SHA-224/256 secure hash algorithm using the AArch32
versions of the ARMv8 Crypto Extensions for SHA2.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry-picked from commit 006d0624fa0d71787448cacee0195bf20f2d47c8)
(increased .cra_priority to 300 because this kernel already had
 commit f2f770d74a8d ("crypto: arm/sha256 - Add optimized SHA-256/224")
 backported to it too)
Change-Id: I2ba82e37426abe77c43f69e8bbd414e75d2dff14
Signed-off-by: Eric Biggers <ebiggers@google.com>