Fix a wrong UID can be logged

This is a prepartion for fixing Bug 34838583

Currently Binder.clearCallingIdentity() is called too early, which
ends up always blaming the system UID when calledWithValidToken()
fails in InputMethodManagerService#updateStatusIcon().

Test: Compile
Bug: 34838583
Change-Id: Id69da24de8269c0c7e31ea9ef3c595c3d69fe40e