Add Aria cipher support and block size info.

Aria cipher is similar to AES and is supported
in Linux kernel crypto API in recent releases.
This patch just add support for internal info table.
(This will cause that it is used also for keyslot
encryption if specified as a cipher argument.)

lib/crypto_backend/cipher_generic.c

@@ -51,6 +51,7 @@ static const struct cipher_alg cipher_algs[] = {
 	{ "xchacha12,aes", "adiantum", 32, false },
 	{ "xchacha20,aes", "adiantum", 32, false },
 	{ "sm4",         NULL, 16, false },
+	{ "aria",        NULL, 16, false },
 	{ NULL,          NULL,  0, false }
 };