Update string description for CAR_TEST_SERVICE permisison

- Use only car and make it consistent with other permission strings

Bug: 142832751
Test: build
Change-Id: Ib8b0017505025c366639df81c24c85d2643ec6d0
(cherry picked from commit 8a33866718180719fe99d49187e8af8e88c7d9dc)
diff --git a/service/res/values/strings.xml b/service/res/values/strings.xml
index 11dd845..1589180 100644
--- a/service/res/values/strings.xml
+++ b/service/res/values/strings.xml
@@ -256,10 +256,10 @@
     <string name="car_permission_label_enroll_trust">Enroll Trusted Device</string>
     <string name="car_permission_desc_enroll_trust">Allow Trusted Device Enrollment</string>
 
-    <!-- Permission text: Control car service's test mode [CHAR LIMIT=NONE] -->
-    <string name="car_permission_label_car_test_service">Control car service\u2019s test mode</string>
-    <!-- Permission text: Control car service's test mode [CHAR LIMIT=NONE] -->
-    <string name="car_permission_desc_car_test_service">Control car service\u2019s test mode</string>
+    <!-- Permission text: Control car's test mode [CHAR LIMIT=NONE] -->
+    <string name="car_permission_label_car_test_service">Control car\u2019s test mode</string>
+    <!-- Permission text: Control car's test mode [CHAR LIMIT=NONE] -->
+    <string name="car_permission_desc_car_test_service">Control car\u2019s test mode</string>
 
     <!-- The default name of device enrolled as trust device [CHAR LIMIT=NONE] -->
     <string name="trust_device_default_name">My Device</string>