In permission checker we used to check the permission for the passed in
uid but the opp-op for the Binder.getCallingUid. In the case the calling
identity was cleared, PermissionChecker ended up checking the app-op of the
current process (often the system server).
Now we check the uid for both the permission and the app-op.
Test: Called PermissionChecker.checkPermission with the calling indentity
cleared.
Fixes: 124116218
Change-Id: Ic0b766f6c75bba1b9dae3e91c6adce85a76ae68f
0d05e48371