Set pwm as sensor type fan

It was being defaulted to reserved.

Change-Id: Idb2f328b0efba3246bf58ffaa6f50c20b6899e23
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/include/sdrutils.hpp b/include/sdrutils.hpp
index 369dc8b..bb75ce4 100644
--- a/include/sdrutils.hpp
+++ b/include/sdrutils.hpp
@@ -95,6 +95,7 @@
                  {"voltage", SensorTypeCodes::voltage},
                  {"current", SensorTypeCodes::current},
                  {"fan_tach", SensorTypeCodes::fan},
+                 {"fan_pwm", SensorTypeCodes::fan},
                  {"power", SensorTypeCodes::other}}};
 
 inline static std::string getSensorTypeStringFromPath(const std::string& path)