Check if location usage has been disavowed for scans in GattService.

This populates the hasDisavowedLocation field based on whether the
client has specified neverForLocation on the BLUETOOTH_SCAN permission.

This field is then used to determine if the filter should be applied
when scan results are sent.

Bug: 183203469
Test: atest GattServiceTest
Change-Id: Id0b4402b9a1974af37d454553794dad563d10e1a