lib/crypto: arm64/aes: Migrate optimized CBC-based MACs into library

Instead of exposing the arm64-optimized CMAC, XCBC-MAC, and CBC-MAC code
via arm64-specific crypto_shash algorithms, instead just implement the
aes_cbcmac_blocks_arch() library function.  This is much simpler, it
makes the corresponding library functions be arm64-optimized, and it
fixes the longstanding issue where this optimized code was disabled by
default.  The corresponding algorithms still remain available through
crypto_shash, but individual architectures no longer need to handle it.

Note that to be compatible with the library using 'size_t' lengths, the
type of the return value and 'blocks' parameter to the assembly
functions had to be changed to 'size_t', and the assembly code had to be
updated accordingly to use the corresponding 64-bit registers.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260218213501.136844-6-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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