VW: Cleanup, migrate center-to-front ratio to CarSpecs (#31668)

* VW: Cleanup after PlatformConfig refactor

* whitespace fix
old-commit-hash: e0c840cd02

selfdrive/car/volkswagen/interface.py

@@ -100,11 +100,8 @@ class CarInterface(CarInterfaceBase):
     ret.vEgoStopping = 0.5
     ret.longitudinalTuning.kpV = [0.1]
     ret.longitudinalTuning.kiV = [0.0]
-
-    # Per-chassis tuning values, override tuning defaults here if desired
-
     ret.autoResumeSng = ret.minEnableSpeed == -1
-    ret.centerToFront = ret.wheelbase * 0.45
+
     return ret
 
   # returns a car.CarState

selfdrive/car/volkswagen/values.py

@@ -132,6 +132,7 @@ class VolkswagenPQPlatformConfig(PlatformConfig):
 
 @dataclass(frozen=True, kw_only=True)
 class VolkswagenCarSpecs(CarSpecs):
+  centerToFrontRatio: float = 0.45
   steerRatio: float = 15.6