move global_platform.py to global_platform/__init__.py

This will allow us to have multiple different modules for different
aspects of global_platform.

Change-Id: Ieca0b20c26a2e41eb11455941164474b76eb3c7a
diff --git a/pySim/global_platform.py b/pySim/global_platform/__init__.py
similarity index 100%
rename from pySim/global_platform.py
rename to pySim/global_platform/__init__.py