Fixed car service dumpsys help documentation.

Noticed a dumpsys car_service --help typo, --list was listed twice one
for services and another for hals. The second one, the one I fixed,
corresponds to hals.

Bug: 150038159
Test: m -j, run emulator, adb shell dumpsys car_service --help
Test: adb shell dumpsys car_services --list-hals
Change-Id: I6ad7451ec037f82b0e2ec9445dbc1b500ce3f809
(cherry picked from commit 1f6d76332d9859e1c116da3bdb5906ea1141da50)
diff --git a/service/src/com/android/car/ICarImpl.java b/service/src/com/android/car/ICarImpl.java
index 36ebd7d..5cf9090 100644
--- a/service/src/com/android/car/ICarImpl.java
+++ b/service/src/com/android/car/ICarImpl.java
@@ -726,8 +726,8 @@
         writer.println("\t  shows this help");
         writer.println("--list");
         writer.println("\t  lists the name of all services");
-        writer.println("--list");
-        writer.println("\t  lists the name of all HAls");
+        writer.println("--list-hals");
+        writer.println("\t  lists the name of all HALs");
         writer.println("--services <SVC1> [SVC2] [SVCN]");
         writer.println("\t  dumps just the specific services, where SVC is just the service class");
         writer.println("\t  name (like CarUserService)");