fscrypt: Use aes_ecb_encrypt() for v1 key derivation

Now that there's a library function aes_ecb_encrypt(), use it instead of
a loop of aes_encrypt() calls.

Note that the use of AES-ECB here is purely for the key derivation
function used by the deprecated v1 encryption policies.  v2 encryption
policies use HKDF-SHA512 instead.  Nevertheless, the original version
has to continue to be supported for backwards compatibility.

Link: https://patch.msgid.link/20260831192411.99035-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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