Include allowChannels info in DNDPolicyProto output.

This applies only when modes_api is on and will cause the policy proto included in both DNDModeProto and DNDStateChanged to reflect the new setting.

Bug: 308673342
Test: ZenModeHelperTest, statsd_testdrive

Change-Id: Icc619a08490e71df4fedc58933a1b2ab1390d24a
4 files changed