Do not use find_packages, list them explicitly

This resolved warning messages like this:

```
writing manifest file 'dpctl.egg-info/SOURCES.txt'
/home/user/miniconda3/conda-bld/dpctl_1668116526346/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pla/lib/python3.9/site-packages/setuptools/command/build_py.py:202: SetuptoolsDeprecationWarning:     Installing 'dpctl.cmake' as data is deprecated, please list it in `packages`.
    !!

    ############################
    # Package would be ignored #
    ############################
        Python recognizes 'dpctl.cmake' as an importable package,
	    but it is not listed in the `packages` configuration of setuptools.

    'dpctl.cmake' has been automatically added to the distribution only
        because it may contain data files, but this behavior is likely to change
	    in future versions of setuptools (and therefore is considered deprecated).

    Please make sure that 'dpctl.cmake' is included as a package by using
        the `packages` configuration field or the proper discovery methods
	    (for example by using `find_namespace_packages(...)`/`find_namespace:`
	        instead of `find_packages(...)`/`find:`).

    You can read more about "package discovery" and "data files" on setuptools
        documentation page.

!!
```

Author: oleksandr-pavlyk

setup.py

@@ -23,7 +23,6 @@
 import skbuild
 import skbuild.setuptools_wrap
 import skbuild.utils
-from setuptools import find_packages
 from skbuild.command.build_py import build_py as _skbuild_build_py
 from skbuild.command.install import install as _skbuild_install
 
@@ -140,7 +139,13 @@ def _get_cmdclass():
     license="Apache 2.0",
     author="Intel Corporation",
     url="https://github.com/IntelPython/dpctl",
-    packages=find_packages(include=["*"]),
+    packages=[
+        "dpctl",
+        "dpctl.memory",
+        "dpctl.tensor",
+        "dpctl.program",
+        "dpctl.utils",
+    ],
     package_data={"dpctl": ["tests/*.*", "tests/helper/*.py"]},
     include_package_data=True,
     zip_safe=False,