lib/crc32: use void pointer for data

Update crc32_le(), crc32_be(), and __crc32c_le() to take the data as a
'const void *' instead of 'const u8 *'.

This makes them slightly easier to use, as it can eliminate the need for
casts in the calling code.  It's the only pointer argument, so there is
no possibility for confusion with another pointer argument.

Also, some of the CRC library functions, for example crc32c() and
crc64_be(), already used 'const void *'.  Let's standardize on that, as
it seems like a better choice.

The underlying base and arch functions continue to use 'const u8 *', as
that is often more convenient for the implementation.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250208024911.14936-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

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