Enable custom clock feature

- Enable ClockOptionsProvider and the flag let SystemUI(keyguard) have
the ability to apply custom clock
- Remove Analog and Bubble clock from SystemUI

Bug: 146530441
Test: `adb shell content query --uri content://com.android.keyguard.clock/list_options` will list available provider, `adb shell settings put secure lock_screen_custom_clock_face "com.android.keyguard.clock.BubbleClockController"` will not switch to Bubble clock.
Change-Id: Iecfb5e2ea0cc72ca6eb1e16ca0dc0213a3257b6e