Call updateKidsModeSettings without holding mLock

This CL stops holding PhoneWindowManager.mLock before calling the
WindowManagerInternal method to avoid the dead lock while trying to
acquire WindowManagerService.mGlobalLock.

Fix: 346153851
Flag: NA
Test: presubmit
Change-Id: If90f4d7071a6c95479c79e0c89c1ac26c8a9deed