Fix the idl generation (no branch needed in included files)

Signed-off-by: Koen Deleij <koen@remonel.se>

spec/Powertrain/EngineCoolant.vspec

@@ -6,26 +6,19 @@
 #
 # SPDX-License-Identifier: MPL-2.0
 
-#
-# Engine coolant
-#
-EngineCoolant:
- type: branch
- description: Signals related to the engine coolant
-
-EngineCoolant.Capacity:
+Capacity:
  datatype: float
  type: attribute
  description: Engine coolant capacity in liters.
  unit: l
 
-EngineCoolant.Temperature:
+Temperature:
  datatype: float
  type: sensor
  unit: celsius
  description: Engine coolant temperature.
 
-EngineCoolant.Level:
+Level:
  datatype: string
  type: sensor
  allowed: [
@@ -35,7 +28,7 @@ EngineCoolant.Level:
  ]
  description: Engine coolant level.
 
-EngineCoolant.LifeRemaining:
+LifeRemaining:
  datatype: int32
  type: sensor
  description: Remaining engine coolant life in seconds.