Added wifi_service permissions to kitchensink app

Kitchensink was constantly throwing SELinux errors when trying to find
wifi_service. Adding the appropriate permission so that kitchensink can
now read that service.

Bug: 139892477

Test: Manually tested on Hawk.
Change-Id: I46c4b3a9e7b3203ff6ccbd064e1209eb8f177f10
diff --git a/car_product/sepolicy/test/kitchensink_app.te b/car_product/sepolicy/test/kitchensink_app.te
index 8093490..1b4ad99 100644
--- a/car_product/sepolicy/test/kitchensink_app.te
+++ b/car_product/sepolicy/test/kitchensink_app.te
@@ -27,6 +27,7 @@
     sensorservice_service
     surfaceflinger_service
     uimode_service
+    wifi_service
 }:service_manager find;
 
 # Read and write /data/data subdirectory.