Removing deprecation level 0 for display.

Latest qcom-display-legacy commits by arco made it
unnecessary:
https://github.com/arco/android_hardware_qcom_display-legacy/commit/7fae34e5c4a1db812e7c014348b81c852dff1a91
https://github.com/arco/android_hardware_qcom_display-legacy/commit/fd3c5a9db971ce40b006fcb64d77b56eb9484b41
https://github.com/arco/android_hardware_qcom_display-legacy/commit/0d9a4f0339194d50325b50cba302435d09422aae
https://github.com/arco/android_hardware_qcom_display-legacy/commit/d64e331e014a459cb6a4f87f9c90f881b62ea41e
https://github.com/arco/android_hardware_qcom_display-legacy/commit/e54f8c1b3e4d4b49997447bd8d471f295fafb707

Change-Id: I216d20bd729614b6f6bfba0a0b96ff92b422ffc3