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: Iad0360f79633132883ebba3d528b55e33e0970e9