Added android.permission.USE_EXACT_ALARM in systemUI

Screen recording from a secondary user need one of the permission from
android.permission.SCHEDULE_EXACT_ALARM,
android.permission.USE_EXACT_ALARM,
android:activate_vpn

Added USE_EXACT_ALARM permission to support screen recording on
the secondary user.

Test: tested screen recording on a secondary user
Bug: 274613098
Bug: 279559510
Change-Id: I164f783690d6f4ddb67daf8f53d1b1804ebe1bda