GM: add support for vehicles with manual parking brakes (commaai#24766)

Switch to general park brake signal

Author: JMPZ11

selfdrive/car/gm/carstate.py

@@ -64,7 +64,7 @@ def update(self, pt_cp, loopback_cp):
     ret.leftBlinker = pt_cp.vl["BCMTurnSignals"]["TurnSignals"] == 1
     ret.rightBlinker = pt_cp.vl["BCMTurnSignals"]["TurnSignals"] == 2
 
-    ret.parkingBrake = pt_cp.vl["EPBStatus"]["EPBClosed"] == 1
+    ret.parkingBrake = pt_cp.vl["VehicleIgnitionAlt"]["ParkBrake"] == 1
     ret.cruiseState.available = pt_cp.vl["ECMEngineStatus"]["CruiseMainOn"] != 0
     ret.espDisabled = pt_cp.vl["ESPStatus"]["TractionControlOn"] != 1
     ret.accFaulted = pt_cp.vl["AcceleratorPedal2"]["CruiseState"] == AccState.FAULTED
@@ -100,7 +100,7 @@ def get_can_parser(CP):
       ("LKATorqueDelivered", "PSCMStatus"),
       ("LKATorqueDeliveredStatus", "PSCMStatus"),
       ("TractionControlOn", "ESPStatus"),
-      ("EPBClosed", "EPBStatus"),
+      ("ParkBrake", "VehicleIgnitionAlt"),
       ("CruiseMainOn", "ECMEngineStatus"),
     ]
 
@@ -110,7 +110,7 @@ def get_can_parser(CP):
       ("PSCMStatus", 10),
       ("ESPStatus", 10),
       ("BCMDoorBeltStatus", 10),
-      ("EPBStatus", 20),
+      ("VehicleIgnitionAlt", 10),
       ("EBCMWheelSpdFront", 20),
       ("EBCMWheelSpdRear", 20),
       ("AcceleratorPedal2", 33),