s/minThermalRPM/minThermalOutput

The minThermalRPM is only an RPM by the fact that
that is the units of the PID. As the PID units can
be anything, change this to minThermalOutput to allow
for different units (i.e. percent).

Change-Id: Ic53fef1159ade5a413e5d519d407947f3023d8e3
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/pid/buildjson.cpp b/pid/buildjson.cpp
index 97f2bf0..b620439 100644
--- a/pid/buildjson.cpp
+++ b/pid/buildjson.cpp
@@ -86,7 +86,7 @@
 
         /* TODO: using at() throws a specific exception we can catch */
         id = zone["id"];
-        thisZoneConfig.minThermalRpm = zone["minThermalRpm"];
+        thisZoneConfig.minThermalOutput = zone["minThermalOutput"];
         thisZoneConfig.failsafePercent = zone["failsafePercent"];
 
         auto pids = zone["pids"];