GEAR_* rename

- change to GEAR_PARK and GEAR_LOW
- also remove some build warnings

bug: 27549456
Change-Id: I9062c4570afe5cacd6a17f1cb196273a719b0a97
diff --git a/include/hardware/vehicle.h b/include/hardware/vehicle.h
index dc1419f..4a080a1 100644
--- a/include/hardware/vehicle.h
+++ b/include/hardware/vehicle.h
@@ -1161,9 +1161,9 @@
     VEHICLE_GEAR_REVERSE    = 0x0002,
 
     // Gear selections (mostly) present only in automatic cars.
-    VEHICLE_GEAR_PARKING    = 0x0004,
+    VEHICLE_GEAR_PARK       = 0x0004,
     VEHICLE_GEAR_DRIVE      = 0x0008,
-    VEHICLE_GEAR_L          = 0x0010,
+    VEHICLE_GEAR_LOW        = 0x0010,
 
     // Other possible gear selections (maybe present in manual or automatic
     // cars).