Don't use hwmon# as indicator of gpu

Previously, during the rsmi_init discovery process, the existence
of an hwmon# directory was used to distinguish between gpus nodes
and non-gpu nodes. This isn't reliable in some scenarios. Instead,
the existence of the vbios_version file is used as an
indicator that the node is indeed a gpu.

Change-Id: Icfbe5c42ed0970077b05f25c3d209308a31bec85

src/rocm_smi_device.cc

@@ -709,7 +709,7 @@ int Device::readDevInfoBinary(DevInfoTypes type, std::size_t b_size,
 
   size_t num = fread(p_binary_data, b_size, 1, ptr);
   fclose(ptr);
-  if((num*b_size) != b_size){
+  if ((num*b_size) != b_size) {
     return ENOENT;
   }
   return 0;