Move crypto_simd_disabled_for_test to lib/ so that crypto_simd_usable()
can be used by library code.

This was discussed previously
(https://lore.kernel.org/linux-crypto/20220716062920.210381-4-ebiggers@kernel.org/)
but was not done because there was no use case yet.  However, this is
now needed for the arm64 CRC32 library code.

Tested with:
    export ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
    echo CONFIG_CRC32=y > .config
    echo CONFIG_MODULES=y >> .config
    echo CONFIG_CRYPTO=m >> .config
    echo CONFIG_DEBUG_KERNEL=y >> .config
    echo CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=n >> .config
    echo CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y >> .config
    make olddefconfig
    make -j$(nproc)

Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>