lib/crypto: tests: Add KUnit tests for SHA-224 and SHA-256

lib/crypto: tests: Add KUnit tests for SHA-224 and SHA-256

Add KUnit test suites for the SHA-224 and SHA-256 library functions,
including the corresponding HMAC support.  The core test logic is in the
previously-added hash-test-template.h.  This commit just adds the actual
KUnit suites, and it adds the generated test vectors to the tree so that
gen-hash-testvecs.py won't have to be run at build time.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250709200112.258500-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>