Remove flag that is unused

This flag was meant to be used for the changes that involve scheduling user start before alarm time, but a decision has been made to define the flag for this in another .aconfig file. This one has been abandoned and can be cleaned up.

Bug: 372670599
Test: N/A
Flag: EXEMPT removing unused flag
Change-Id: Ia50f2f003877976498c8899c07e0d4490d96452e