Fix LOCATION_PROVIDERS_ALLOWED with provider status

Ensures that LOCATION_PROVIDERS_ALLOWED is properly updated through all
location provider state changes, including location on/off. Remove all
initialization of LOCATION_PROVIDERS_ALLOWED, as the setting is now
completely controlled by LMS.

Bug: 124300200
Test: Manually
Change-Id: Ic715347515bcc417d873c48113ce4303685c0aa7