Turn off clang-format for vehicle property generated files

clang-format hurts readability for these generated files.

Bug: 266986551
Test: manual build
Change-Id: I78432f4dd208ab1a554e16342a9a568f9a7a104d
diff --git a/automotive/vehicle/tools/generate_annotation_enums.py b/automotive/vehicle/tools/generate_annotation_enums.py
index 85c521a..c36cbb0 100644
--- a/automotive/vehicle/tools/generate_annotation_enums.py
+++ b/automotive/vehicle/tools/generate_annotation_enums.py
@@ -69,6 +69,8 @@
  * Generated by tools/generate_annotation_enums.py.
  */
 
+// clang-format off
+
 """
 
 CHANGE_MODE_CPP_HEADER = """#ifndef android_hardware_automotive_vehicle_aidl_generated_lib_ChangeModeForVehicleProperty_H_