Do not schedule alarm wakeups for SYSTEM users.

SYSTEM users can never be stopped, so waking them up is not necessary. On non-HSUM devices, this also means Main user.

On HSUM SYSTEM doesn't schedule user facing alarms so no need to schedule wake

Bug: 352696527
Test: atest UserWakeupStore
Flag: com.android.server.alarm.start_user_before_scheduled_alarms
Change-Id: Ib5709ff2c55ed756478e4e74a49a4681bd332d8d