lib/crypto: riscv/aes-cbc: Migrate optimized code into library

Instead of exposing the riscv-optimized AES-CBC and AES-CBC-CTS code via
a riscv-specific crypto_skcipher algorithm, just implement the AES-CBC
and AES-CBC-CTS library functions.  This is simpler, it makes the
AES-CBC and AES-CBC-CTS library functions be riscv-optimized, and it
also fixes the longstanding issue where the riscv-optimized AES-CBC and
AES-CBC-CTS code was disabled by default.  AES-CBC and AES-CBC-CTS
support still remains available through crypto_skcipher via
crypto/aes.c, but individual architectures no longer need to handle it.

To match what the library expects, update the assembly functions to
operate on struct aes_enckey or struct aes_key rather than struct
crypto_aes_ctx, and adjust the argument order.

Remove the single-block special case from the assembly code, since it's
already handled by lib/crypto/aes.c before calling aes_cbc_cts_*_arch().

Bump up the priority of the corresponding library-based algorithms on
riscv now that they no longer have to be lower than arch/riscv/crypto/.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260927224418.109759-19-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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