Root cause:
Original framework design which has 3 seconds restriction to prevent users from easily triggering the accessibility volume shortcut when first time using it.
Solution:
The system would bypass the 3 seconds restriction if users manually set any feature as the volume key shortcut.
Bug: 202602908
Test: make RunSettingsRoboTests ROBOTEST_FILTER=ToggleFeaturePreferenceFragmentTest
Change-Id: I324321577263904b6ff8b66e411766d16a6430dc
f94762176f