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_utils.h

@@ -46,7 +46,7 @@
 #ifndef TESTS_AMD_SMI_TEST_TEST_UTILS_H_
 #define TESTS_AMD_SMI_TEST_TEST_UTILS_H_
 
-#include "amd_smi.h"
+#include "amd_smi/amd_smi.h"
 
 const char *
 NameFromFWEnum(amdsmi_fw_block_t blk);