Clear caller identity in IPC methods

A utility method should not be responsible for clearing the
caller identity. Clearing caller identity should happen in
methods that process binder IPCs, not general utility methods.

Update it to clear in each method.

Bug: 279381469
Test: atest FrameworksNetTests
Change-Id: I95b520fb0d7851ec3e14fbd16044d5f877c74561
1 file changed