lib/crypto: arm64/ghash: Migrate optimized code into library

Remove the "ghash-neon" crypto_shash algorithm.  Move the corresponding
assembly code into lib/crypto/, and wire it up to the GHASH library.

This makes the GHASH library be optimized on arm64 (though only with
NEON, not PMULL; for now the goal is just parity with crypto_shash).  It
greatly reduces the amount of arm64-specific glue code that is needed,
and it fixes the issue where this optimization was disabled by default.

To integrate the assembly code correctly with the library, make the
following tweaks:

- Change the type of 'blocks' from int to size_t
- Change the types of 'dg' and 'h' to polyval_elem.  Note that this
  simply reflects the format that the code was already using.
- Remove the 'head' argument, which is no longer needed.
- Remove the CFI stubs, as indirect calls are no longer used.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260319061723.1140720-10-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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