tf_fuzz: refactor includes to only include what is needed

* Refactor Makefile to automatically gather prerequisites.

* Change the includes (using include-what-you-need) so that files only
  include the specific headers they need. Many includes are also now
  inside the .hpp files instead of the .cpp files.

  This improves editor support: previously, external symbols in .hpp
  files would not be resolved by clangd due to .hpp files not having any
  imports.

Change-Id: Iece03f81c35aa43ac026aaeb49b87d2c4acf07cd
Signed-off-by: Nik Dewally <Nik.Dewally@arm.com>
40 files changed