Clear the caller identity after the permission is verified

For the method requestNetworkScan(...), the caller identity was cleared
after verifying the permission in aosp/722888, but in a later cl
aosp/836166, this logic was removed which is causing issues.

Bug: 128480460
Test: manual test

Merged-In: I1f145e7e63cd7c366f51710896cdd02b0df410ab
Change-Id: I1f145e7e63cd7c366f51710896cdd02b0df410ab
(cherry picked from commit 4bf8f4ed4136ef7346dc349abbad3ef75eb08224)
1 file changed