Remove redundant requestedState from IpServer#enable

IpServer#enable is called with both a non-null TetheringRequest and the
requestedState, but the requestedState is derived from the
TetheringRequest's connectivity scope. Remove this requestedState arg
and simply have IpServer read the connectivity scope itself.

Bug: 216524590
Test: covered by existing tests
Change-Id: I73227f5053da3a2ab35563268fc416b6dd9b1801
3 files changed