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/power_read_write.cc

@@ -52,7 +52,7 @@
 #include <algorithm>
 
 #include "gtest/gtest.h"
-#include "amd_smi.h"
+#include "amd_smi/amd_smi.h"
 #include "amd_smi_test/functional/power_read_write.h"
 #include "amd_smi_test/test_common.h"