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/setup.cfg.in

@@ -4,3 +4,6 @@
 [metadata]
 name = amdsmi
 version = @amd_smi_libraries_VERSION_STRING@
+
+[options.package_data]
+amdsmi = *.so