Update codeobj disassembly to use comgr va2fo API (#250)

* Update codeobj disassembly to use comgr va2fo API

* Format

* Tidy fix

* Tidy fix

* Review comments

---------

Co-authored-by: Giovanni Baraldi <gbaraldi@amd.com>

source/include/rocprofiler-sdk/cxx/codeobj/code_printing.hpp

@@ -22,6 +22,9 @@
 
 #pragma once
 
+#include "disassembly.hpp"
+#include "segment.hpp"
+
 #include <elfutils/libdw.h>
 #include <hsa/amd_hsa_elf.h>
 
@@ -35,9 +38,6 @@
 #include <unordered_map>
 #include <vector>
 
-#include "disassembly.hpp"
-#include "segment.hpp"
-
 namespace rocprofiler
 {
 namespace sdk
@@ -169,7 +169,7 @@ public:
     std::optional<uint64_t> va2fo(uint64_t vaddr) const
     {
         if(disassembly) return disassembly->va2fo(vaddr);
-        return {};
+        return std::nullopt;
     };
 
     std::unique_ptr<Instruction> disassemble_instruction(uint64_t faddr, uint64_t vaddr)