Bring back Quiet hours function and QS tile, (1/2):

See "main" commits:

frameworks/base:
https://github.com/XXMrHyde/android_frameworks_base/commit/47a89e89072c622d02f8f5a7cb2435fc8bc2f7b1

Settings:
https://github.com/XXMrHyde/android_packages_apps_Settings/commit/5815b09373d37bc765f55c80e4232db7bd0f1ef4

services/Telephony:
https://github.com/XXMrHyde/android_packages_services_Telephony/commit/990302174bce3012153f05764ea2083df3de5fe7