Support to accumulate controllers' output PWM and don't calculate PID output if input temperature was lower than setpoint

new_method_to_cal_pwm

Description:
1. Add one property, accumulateSetPoint, in fan table that could be used to enable accumulation of the output PWM of 
 different controllers with same sensors.
 
 e.g. If we have two controllers named "Stepwise_Temp_CPU0" and "PID_Temp_CPU0" in fan table that used to monitor
 the temperature of CPU, their profile name would be "Temp_CPU0". 
 
 If we set accumulateSetPoint to true in zones field, the output PWM of "Stepwise_Temp_CPU0" and "PID_Temp_CPU0" 
 will be accumulated.
 
2. Add one property, checkHysterWithSetpt, in pid info of fan table to select to calculate PID output by checking the 
 hysteresis using setpoint temperature and don't calculate PID output if input temperature was lower than setpoint.
 
Design:
1. Search accumulateSetPoint field in fan table, if the value was true, accumulate the output PWM of different
 contorllers with same profile name.
 
2. Support two method to calculate PID output that could be chosen by setting the "checkHysterWithSetpt" to true in 
   pid info of fan table.
   If the flag was set to true, it won't calculate PWM output if the input lower than setpoint.

Test Case:
1. Check the output PWM of different controllers with same profile name could be accumulated - pass.
 
2. Set "checkHysterWithSetpt" and check PID output would not be calculated if the input temperature was lower than setpoint - pass.