Relief unnecessary dependencies of code order

The original code requires updating mLastIPv6LinkProperties before
calling updateIpv6ForwardingRules because mLastIPv6LinkProperties will
be used inside an internal function later. Remove this unnecessary
dependency by passing the interface name into the function.

Bug: 294025403
Test: atest TetheringTests
Change-Id: I5699fba3d7caf3314d102b643b02da2b2797dd66