Categorize Integrated Billing host files with their patches

Move each file from 'Packages/Integrated Billing/Uncategorized/' into
the 'Packages/Integrated Billing/Patches/IB_2.0_<n>' directory
referencing it.  This special case was not picked up automatically by
the PopulatePatchesByPackage.py script so the files were previously
placed manually.  Now put them in a better place.

Change-Id: Ia2df46693327671c72301a69b2b14df9019ebe9a