MLBEDSW-4417: Explicitly set packages in setup.py

This commit removes usage of the function
find_namespace_packages (which is not available in
older versions of setuptools) and instead explicitly
states the namespace packages in setup.py.

Signed-off-by: Dwight Lidman <dwight.lidman@arm.com>
Change-Id: I942f339953d50a7bf5fc3e83c0736813fea58dd2
diff --git a/README.md b/README.md
index edd3fe7..2d871e7 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,6 @@
 command:
 
 ```bash
-pip3 install -U setuptools>=40.1.0
 pip3 install .
 ```
 
diff --git a/setup.py b/setup.py
index b2c25ea..18c0bc7 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,6 @@
 import re
 
 from setuptools import Extension
-from setuptools import find_namespace_packages
 from setuptools import setup
 from setuptools.command.build_ext import build_ext
 
@@ -83,8 +82,8 @@
         "Topic :: Software Development :: Compilers",
     ],
     keywords=["ethos-u", "vela compiler", "tflite", "npu"],
-    packages=find_namespace_packages(include=["ethosu.*"]),
-    python_requires="~=3.6",  # We only test for 3.6.*
+    packages=["ethosu.vela", "ethosu.mlw_codec"],
+    python_requires="~=3.6",  # We support only 3.6+
     install_requires=[
         "flatbuffers==1.12.0",
         "numpy>=1.16.6",