Allow Recents in current user to access APIs in its child profile

At this point, we just need to whitelist Recents for these:
isDeviceLocked
loadTaskDescriptionIcon
getActivityInfo

However, I think in the long run, it may need more than that, so I
modified AMS.handleIncomingUser accordingly. PKMS does not use
handleIncomingUser and hence isRecentsAccessingChildProfiles is
introduced there.

Fix: 71722266

Test: Manual
1. Setup work profile
2. Launch some work and personal apps
3. Swipe up to see the new Recents
3. Can see recent apps are rendered correctly with icons badged
   accordingly.
4. Can switch to the task
5. Can remove task

Change-Id: I56b5f6091c232fc8327e01de472467d630570030