Change sensor Value to double

Generally most demons we've looked at take the int64 values and
immediately translates the value to a double. As the individual demons
are doing the floating point computation anyway, there doesn't seem to be
a large benefit to keeping separating the value on dbus, only to recompute
in each demon, causing extra overhead for consumers. In some cases this
causes an extra d-bus call, for instance when reading a threshold a
consumer to know the value needs to also access the value field to get
the scale, which is arguably more expensive than having the property be a
double in the first place.

Change-Id: If47c19f77286e3764d167a6843ba91e2ca1769b8
Signed-off-by: James Feist <james.feist@linux.intel.com>

xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml

@@ -15,11 +15,11 @@ description: >
 
 properties:
     - name: CriticalHigh
-      type: int64
+      type: double
       description: >
           The upper bound of the critical threshold.
     - name: CriticalLow
-      type: int64
+      type: double
       description: >
           The lower bound of the critical threshold.
     - name: CriticalAlarmHigh

xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml

@@ -16,11 +16,11 @@ description: >
 
 properties:
     - name: WarningHigh
-      type: int64
+      type: double
       description: >
           The upper bound of the warning threshold.
     - name: WarningLow
-      type: int64
+      type: double
       description: >
           The lower bound of the warning threshold.
     - name: WarningAlarmHigh

xyz/openbmc_project/Sensor/Value.interface.yaml

@@ -19,15 +19,15 @@ description: >
 
 properties:
     - name: Value
-      type: int64
+      type: double
       description: >
           The sensor reading.
     - name: MaxValue
-      type: int64
+      type: double
       description: >
           The Maximum supported sensor reading.
     - name: MinValue
-      type: int64
+      type: double
       description: >
           The Minimum supported sensor reading.
     - name: Unit
@@ -42,11 +42,6 @@ properties:
           For objects in the power namespace, Unit must be "Watts".
           For objects in the energy namespace, Unit must be "Joules".
           For objects in the utilization namespace, Unit must be "Percent"
-    - name: Scale
-      type: int64
-      description: >
-          The reading scaling factor N, where the actual reading is Value * 10^N.
-          This is immutable once set for a sensor.
 
 enumerations:
     - name: Unit