QAT Header Hiding

For the sync QAT, the QAT headers are included into the library after it
has been built and is being used. The actual headers should only be used
when building wolfSSL and should be hidden from the user.
1. Most of the functions in the sync QAT and OCTEON headers don't need
to be exported. Move all of that into the source files. Only export the
init and deinit functions.
2. Remove inline from the OCTEON support functions.
3. Remove the AES-ECB files for sync OCTEON as unused.
4. Configure defaults to OCTEON2 build, can be overridden with variable.