[TFLite] Add missing includes
Not sure what the best approach is for grabbing the files. I've used `populate_tflite_source_vars` and manual additions to variables depending upon what was used in the surrounding context as there didn't seem to be any super clear pattern, but I'm very willing to change the approach if something else is preferred. @terryheo Are you able to take a look at this when you get a chance? Thanks!
Some of these files are included by some of the main header files such as interpreter.h but aren't included in the install. This causes build failures when using TFLite built in some configurations.

This was also causing build failures when building LLVM with a near tip of tree TFLite.

CC: @mtrofin @petrhosek 

Also related to https://github.com/google/ml-compiler-opt/pull/293.