Fixed the incorrect uid check for HSUM mode

In the HSUM mode, the uid is pre-fixed with user id. Fixed by
using the correct method to check uid.

Fix: 367402314
Flag: EXEMPT bug fix
Test: Basic telephony functionality tests
Test: atest FrameworksTelephonyTests TeleServicesTest
Change-Id: Ic3bdd49c800475b4041e2d65fcbb65f0d29e89a5