Add missed lock for startHomeOnDisplay

Missing mGlobalLock while calling to RootActivityContainer.

Bug: 128955176
Bug: 127348870
Test: atest ActivityManagerMultiDisplayTests
Test: atest ActivityManagerActivityVisibilityTests
Test: atest ActivityManagerSplitScreenTests#testMinimizeAndUnminimizeThenGoingHome
Test: atest ActivityMetricsLoggerTests#testAppHotLaunchSetsWaitResultDelayData
Change-Id: I1fefaabc0c5ad2b38be4bd3b02b998cad93cdd20
1 file changed