Move alarms_and_reminders strings to SettingsLib

This allows form-factor-specific Settings apps to use the strings as
well as phone settings.

Test: make installclean; make Settings; make TvSettings;
Test: make -j RunSettingsRoboTests
Bug: 181284165
Change-Id: Ibc28160999d82ec6b1f6437ae887925df29dfaff