aes: add code to encrypt/decrypt using the aes engine

[DacoTaco]

@GaryOderNichts since it is mostly your code, feel free to review the changes in libogc to support the aes engine through /dev/aes

ill merge it when you accept the changes to your code

[DacoTaco]

huh, i didn't notice the spaces before. fixed it, together with your other remarks