rename RPMSetPoint to SetPoint

The PIDs were originally focused on collecting RPM set points from
thermal PIDs and then having fan PIDs use the highest value collected,
it doesn't need to be strictly an RPM set point.

It does however need to be one type of value.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I1d589cf4b2688d7e86030c10496d737dc5bbdadf
diff --git a/pid/zone.cpp b/pid/zone.cpp
index e206e17..47d6695 100644
--- a/pid/zone.cpp
+++ b/pid/zone.cpp
@@ -61,9 +61,9 @@
     return _zoneId;
 }
 
-void PIDZone::addRPMSetPoint(double setpoint)
+void PIDZone::addSetPoint(double setpoint)
 {
-    _RPMSetPoints.push_back(setpoint);
+    _SetPoints.push_back(setpoint);
 }
 
 void PIDZone::addRPMCeiling(double ceiling)
@@ -76,9 +76,9 @@
     _RPMCeilings.clear();
 }
 
-void PIDZone::clearRPMSetPoints(void)
+void PIDZone::clearSetPoints(void)
 {
-    _RPMSetPoints.clear();
+    _SetPoints.clear();
 }
 
 double PIDZone::getFailSafePercent(void) const
@@ -121,9 +121,9 @@
     double max = 0;
     std::vector<double>::iterator result;
 
-    if (_RPMSetPoints.size() > 0)
+    if (_SetPoints.size() > 0)
     {
-        result = std::max_element(_RPMSetPoints.begin(), _RPMSetPoints.end());
+        result = std::max_element(_SetPoints.begin(), _SetPoints.end());
         max = *result;
     }