Add basic Elbrus CPU temperature support

This currently hardcodes the node number (and there might be
other temperature labels and even other temperature modules
judging by some scripts in Rumia)

src/cpu.cpp

@@ -537,6 +537,9 @@ bool CPUStats::GetCpuFile() {
             // Only break if module has CPU node
             if (find_input(path, "temp", input, "CPU"))
                 break;
+        } else if (name == "l_pcs") { // Elbrus temperature module
+            find_input(path, "temp", input, "Node 0 Max");
+            break;
         } else {
             path.clear();
         }