Fix platform parsing

Created by: derkling

We have pretty old issues, like #7 (closed), which should address the cleanup of the codebased to remove any hardcoded dependency on bL platforms. This is not such a big refactoring but still these are small fixes for parsing of SMP generated traces which needs to be merged to get new APIs like https://github.com/ARM-software/lisa/pull/302 working properly for example using systrace on Pixel phones.