[DO NOT MERGE] Support display cutout for multi-display devices

- Add a new string array config that stores the unique id of each
  display and when loading the cutout configs we first look up the index
  of the unique id of the added display in the array and use this index
  to load the corresponding cutout configs.
- Add new array configs for every cutout configs.

Bug: 186604541
Test: make
Test: check the device and see if the cutout is correctly set for each
display

Change-Id: I038832795c11cd16969caff5031fa1090493b008