Remove absolute link to libamd_smi.so

Also modify README to include:
  export PATH="$PATH:/opt/rocm/bin"

Change-Id: Ib4513d61fd3e6b23cc789491c11d83e6a6de947a
Signed-off-by: Galantsev, Dmitrii <dmitrii.galantsev@amd.com>

py-interface/pyproject.toml.in

@@ -25,3 +25,7 @@ dependencies = [
 
 [tool.setuptools]
 packages = ["amdsmi"]
+
+# install libamd_smi.so
+[tool.setuptools.package-data]
+amdsmi = ["*.so"]