Starts Automotive Display service on boot

This CL removes 'disable' option from the automotive display service's
rc file to start the service automatically.

Bug: 156293203
Test: Confirmed the service from lshal result
Change-Id: Ie6601ce3a5b956bf6c55be0dc35bbcb23029eda9
diff --git a/services/automotive/display/android.frameworks.automotive.display@1.0-service.rc b/services/automotive/display/android.frameworks.automotive.display@1.0-service.rc
index ffb7b5e..5c7f344 100644
--- a/services/automotive/display/android.frameworks.automotive.display@1.0-service.rc
+++ b/services/automotive/display/android.frameworks.automotive.display@1.0-service.rc
@@ -2,4 +2,3 @@
     class hal
     user graphics
     group automotive_evs
-    disabled  # will not automatically start with its class; must be explicitly started.