Move rocm_smi related function to rocm_smi folder. Move amd_smi to
top level include/ and src/ folder. Remove obsolte oam folder.
Change the CMakeLists.txt to update folder locations.
Change-Id: I52e6be739e49f3b0545865f25364787f5985e9c3
[ROCm/amdsmi commit: 0c91ef919d]