Enable SMS in carrier demo mode

Fixes: 34861667
Test: manually verified default SMS app works in carrier demo mode.
Change-Id: Ic6f1065954e5bb54c6b78b3d604811333f6863e4

services/retaildemo/java/com/android/server/retaildemo/RetailDemoModeService.java

@@ -353,6 +353,10 @@ public class RetailDemoModeService extends SystemService {
         um.setUserRestriction(UserManager.DISALLOW_OUTGOING_CALLS, false, user);
         // Disallow rebooting in safe mode - controlled by user 0
         um.setUserRestriction(UserManager.DISALLOW_SAFE_BOOT, true, UserHandle.SYSTEM);
+        if (mIsCarrierDemoMode) {
+            // Enable SMS in carrier demo mode.
+            um.setUserRestriction(UserManager.DISALLOW_SMS, false, user);
+        }
 
         Settings.Secure.putIntForUser(getContext().getContentResolver(),
                 Settings.Secure.SKIP_FIRST_USE_HINTS, 1, userInfo.id);