Remove the long-running FGS exemption with bg location access

They're not really correlated and there is exemption for the FGS
with type location already.

Bug: 200326767
Bug: 217964313
Test: atest FrameworksMockingServicesTests:BackgroundRestrictionTest
Change-Id: I3e138de0a0dfae5976aad4a6b0ca2fe1cdc87e17