Adding user forced app standby to alarms

The app op RUN_ANY_IN_BACKGROUND can be set to ignored to indicate that
any alarms for the receiving app will be delayed until the app op is set
to allowed or the app comes into the foreground. Power whitelisted apps
are exempted.

Test: cts-tradefed run cts-dev -m AlarmManagerTestCases

Fixes: 64446607
Change-Id: Ic48b52383ad5ccd726c62769cdca25202d1e3814