crypto: lib/chacha - strongly type the ChaCha state

The ChaCha state matrix is 16 32-bit words. Currently it is represented
in the code as a raw u32 array, or even just a pointer to u32. This
weak

crypto: lib/chacha - strongly type the ChaCha state

The ChaCha state matrix is 16 32-bit words. Currently it is represented
in the code as a raw u32 array, or even just a pointer to u32. This
weak typing is error-prone. Instead, introduce struct chacha_state:

struct chacha_state {
u32 x[16];
};

Convert all ChaCha and HChaCha functions to use struct chacha_state.
No functional changes.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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