Restructure the folder

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

tests/amd_smi_test/functional/api_support_read.cc

@@ -50,7 +50,7 @@
 #include <string>
 
 #include "gtest/gtest.h"
-#include "amd_smi.h"
+#include "amd_smi/amd_smi.h"
 #include "amd_smi_test/functional/api_support_read.h"
 #include "amd_smi_test/test_common.h"
 #include "amd_smi_test/test_utils.h"