Enable VCN tracing in Perfetto output (#65)

Enable VCN activity tracing on different instances from the GPU metrics fetched using rsmi_dev_gpu_metrics_info_get in the ROCm-SMI. library.

The tracing can be controlled with ROCPROFSYS_ROCM_SMI_METRICS by setting the value as vcn_activity, Currently this configuration takes the following values: busy, temp, power, mem_usage, vcn_activity.
By default, all the 5 values will be enabled.

Signed-off-by: Sajina P Kandy <Sajina.PuthalathKandy@amd.com>
Co-authored-by: Sajina Kandy <sputhala-amd@amd.com>

source/lib/rocprof-sys/library/sampling.cpp

@@ -129,6 +129,7 @@ using component::sampling_gpu_busy;
 using component::sampling_gpu_memory;
 using component::sampling_gpu_power;
 using component::sampling_gpu_temp;
+using component::sampling_gpu_vcn;
 using component::sampling_percent;
 using component::sampling_wall_clock;
 }  // namespace sampling
@@ -1572,6 +1573,12 @@ struct sampling_initialization
         sampling_gpu_temp::display_unit() = "degC";
         sampling_gpu_temp::set_precision(1);
         sampling_gpu_temp::set_format_flags(sampling_gpu_temp::get_format_flags());
+
+        sampling_gpu_vcn::label()       = "sampling_gpu_vcn_percent";
+        sampling_gpu_vcn::description() = "Utilization of VCN(s)";
+        sampling_gpu_vcn::set_precision(0);
+        sampling_gpu_vcn::set_format_flags(sampling_gpu_vcn::get_format_flags() &
+                                           std::ios_base::showpoint);
     }
 };
 }  // namespace