noise: take locks for ss precomputation

Usually this is called from handshake_init, where locking doesn't matter
because nothing references it yet, but it's also called when changing
the device private key, so it's probably a good thing to not process a
handshake with a ss precomputation that's part old and part new.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

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