Initial commit se05x-aes-key

The app provides the functions to:
1. setkey: Read text file and inject a key at a specified address
2. getkey: Read out key from a specified address and write it to a file
3. erasekey: Erase a key at a specific address

At the moment, it is not possible to use all adresses of the SE. This is
due to failing get_handle requests on some adresses. It looks like
this is a problem of the build configuration, as the get_handle requests
work when using the yocto default configuration of the full package.