Include JSON conformance files in python package.

Fix for tosa_verif_conformance_generator as it needs JSON files
to build the conformance tests.

Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: I3509efee671d34d99eee98141400542374dc4f24
diff --git a/setup.cfg b/setup.cfg
index 56974bd..1140c9c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -22,6 +22,7 @@
     numpy
     flatbuffers == 1.12
 python_requires = >=3.6
+include_package_data = True
 packages =
     runner
     generator