(IMPORTANT: AFAR V ) Hide PC sampling if HSA does not support it. (#881)

* Hide PC sampling if HSA does not support it.

* missing hsa.hpp include

source/lib/rocprofiler-sdk/context/context.cpp

@@ -323,7 +323,9 @@ start_context(rocprofiler_context_id_t context_id)
     if(cfg->counter_collection) rocprofiler::counters::start_context(cfg);
     if(cfg->thread_trace) cfg->thread_trace->start_context();
     if(cfg->agent_counter_collection) status = rocprofiler::counters::start_agent_ctx(cfg);
+#if ROCPROFILER_SDK_HSA_PC_SAMPLING > 0
     if(cfg->pc_sampler) status = rocprofiler::pc_sampling::start_service(cfg);
+#endif
 
     return status;
 }
@@ -360,10 +362,12 @@ stop_context(rocprofiler_context_id_t idx)
                     rocprofiler::counters::stop_agent_ctx(const_cast<context*>(_expected));
                 }
 
+#if ROCPROFILER_SDK_HSA_PC_SAMPLING > 0
                 if(_expected->pc_sampler)
                 {
                     rocprofiler::pc_sampling::stop_service(_expected);
                 }
+#endif
 
                 return ROCPROFILER_STATUS_SUCCESS;
             }