fscrypt: rename FS_KEY_DERIVATION_NONCE_SIZE
The name "FS_KEY_DERIVATION_NONCE_SIZE" is a bit outdated since due to the addition of FSCRYPT_POLICY_FLAG_DIRECT_KEY, the file nonce may now be used as a tweak instead of for key derivation. Also, we're now prefixing the fscrypt constants with "FSCRYPT_" instead of "FS_". Therefore, rename this constant to FSCRYPT_FILE_NONCE_SIZE. Link: https://lore.kernel.org/r/20200708215722.147154-1-ebiggers@kernel.orgSigned-off-by: NEric Biggers <ebiggers@google.com>
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