crypto: Move blake2s_hmac() to its only user wg_noise.c

The blake2s_hmac() is simply an ad-hoc HMAC implementation using the
BLAKE2s hash algorithm. It's not generic; a proper solution is to
implem

crypto: Move blake2s_hmac() to its only user wg_noise.c

The blake2s_hmac() is simply an ad-hoc HMAC implementation using the
BLAKE2s hash algorithm. It's not generic; a proper solution is to
implement the HMAC construction that supports any hash algorithms.
Therefore, it's better to move blake2s_hmac() to wg_noise.c as
noise_hmac().

See also: https://git.zx2c4.com/wireguard-freebsd/commit/?id=5c5832279855722b939a381b9a291dc5ca2ee52e

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crypto: Fix the KKASSERT() in blake2s_init_key()

crypto: Minor cleanups to blake2s

- Adjust the KKASSERT() to be easier to read.
- Add KKASSERT() to blake2s_hmac(), avoiding the possible misuse of
passing a too large 'outlen', which could cause

crypto: Minor cleanups to blake2s

- Adjust the KKASSERT() to be easier to read.
- Add KKASSERT() to blake2s_hmac(), avoiding the possible misuse of
passing a too large 'outlen', which could cause panic or data
corruption.
- Minor style cleanups.

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crypto: Remove unnecessary 'const' qualifiers in blake2s

crypto: Adjust blake2 and hook to build

Make necessary changes to make it build. Meanwhile, adjust the style a
bit to look more consistent.

crypto: Import BLAKE2s implementation from OpenBSD

Required by the in-kernel WireGuard VPN.