Fix PSU pwm issue.

PSU pwm value range is 0-100, which is not same with
system fan 0-255.
There is an issue when PID to change the PSU pwm
based on percentage.

Tested:
PSU pwm just allowed 0-100.
PSU fan speed is runing as expected based on the percentage.

Change-Id: I3ae591828f5b0d85ab6358af666e4f2ab2e0a447
Signed-off-by: Kuiying Wang <kuiying.wang@intel.com>
diff --git a/include/PwmSensor.hpp b/include/PwmSensor.hpp
index 22614e6..69a35c4 100644
--- a/include/PwmSensor.hpp
+++ b/include/PwmSensor.hpp
@@ -22,6 +22,7 @@
     std::shared_ptr<sdbusplus::asio::dbus_interface> sensorInterface;
     std::shared_ptr<sdbusplus::asio::dbus_interface> controlInterface;
     std::shared_ptr<sdbusplus::asio::dbus_interface> association;
+    size_t pwmMax;
     void setValue(uint32_t value);
     uint32_t getValue(bool errThrow = true);
 };