Remove unneeded aes_i.h inclusion from number of places

The BLOCK_SIZE define can be made more specific by using AES_ prefix and
by moving it to aes.h. After this, most aes-*.c do not really need to
include anything from the internal aes_i.h header file. In other words,
aes_i.h can now be used only for the code that uses the internal AES
block operation implementation and none of the code that can use AES
implementation from an external library do not need to include this
header file.

src/crypto/aes.h

@@ -15,6 +15,8 @@
 #ifndef AES_H
 #define AES_H
 
+#define AES_BLOCK_SIZE 16
+
 void * aes_encrypt_init(const u8 *key, size_t len);
 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt);
 void aes_encrypt_deinit(void *ctx);