Remove locking when dispatching to app op policy

This is to avoid negative impact on app op operations
and also address the impact on app start time.

bug: 184085509

Test: atest CtsAppOpsTestCases
      atest CtsAppOps2TestCases
      atest CtsPermissionTestCases
      atest CtsPermission2TestCases
      atest CtsPermission3TestCases
      atest CtsPermission4TestCases
      atest CtsPermission5TestCases

Change-Id: Ib27d05e285113dbf5be3d1c7b93147ddcb13054f