Restrict Headless system user camera access

After implementation review by Security team, recommendation
is to only allow headless system user camera access for automotive
form factor.

Bug: 317056356
Test: Build and test using KitchenSink on automotive reference platform. Not able to test CtsCameraHeadlessSystemUserTestCases on tablet form factor with lunch target cf_x86_64_tablet_hsum-trunk_staging-userdebug as the CTS test switches to User 0 for the test case and the tablet has system restriction and does not allow switch to User 0.

Change-Id: Ibfda4e4403d34e12957d2d1980fcb2936f53ec9a

services/core/java/com/android/server/camera/CameraServiceProxy.java

@@ -1020,6 +1020,10 @@ public class CameraServiceProxy extends SystemService
         }
     }
 
+    private boolean isAutomotive() {
+        return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_AUTOMOTIVE);
+    }
+
     private Set<Integer> getEnabledUserHandles(int currentUserHandle) {
         int[] userProfiles = mUserManager.getEnabledProfileIds(currentUserHandle);
         Set<Integer> handles = new ArraySet<>(userProfiles.length);
@@ -1030,8 +1034,8 @@ public class CameraServiceProxy extends SystemService
 
         if (Flags.cameraHsumPermission()) {
             // If the device is running in headless system user mode then allow
-            // User 0 to access camera.
-            if (UserManager.isHeadlessSystemUserMode()) {
+            // User 0 to access camera only for automotive form factor.
+            if (UserManager.isHeadlessSystemUserMode() && isAutomotive()) {
                 handles.add(UserHandle.USER_SYSTEM);
             }
         }