Update AppleTV-A2169.yaml (#989)

adding "u_height: 0" needed for new netbox update

device-types/Apple/AppleTV-A2169.yaml

@@ -4,6 +4,7 @@ model: AppleTV11,1
 slug: appletv111
 part_number: A2169
 is_full_depth: false
+u_height: 0
 comments: "- Order Number: \tMXGY2LL/A\r\n- Model Number: A2169\r\n- EMC: 3111\r\n\
   - Edition: 4K (2nd Gen)\r\n- Processor Speed: 2.49 GHz\r\n- Processor Type: A12\
   \ Bionic\r\n- Processors (Cores): 1\r\n- Hard Drive: \t32, 64 GB\r\n- RAM: 3GB\r\