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Fix drag notification to split
On drag notification to split case, the pending intent calling Uid should be app's Uid and lead to this start failed due to not system and app didn't visible. Put allow background activity flag on split side to ensure it could start successful and active split screen. Fix: 234406935 Test: manual Test: pass existing tests Change-Id: Ib52023f6d79d166b2b01948f2481350280a094f3