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/test_common.cc

@@ -53,7 +53,7 @@
 
 #include "amd_smi_test/test_base.h"
 #include "amd_smi_test/test_common.h"
-#include "amd_smi.h"
+#include "amd_smi/amd_smi.h"
 
 static const std::map<amdsmi_dev_perf_level_t, const char *>
    kDevPerfLvlNameMap = {