Replace ip_link_add with setup_network.

The setup_network binary has some conditional logic to handle host
images that are VLAN-capable versus host images that aren't. Because
init scripts aren't set up for conditional logic, the logic is moved
into the implementation of the binary. The binary must be invoked with
an argument telling it whether or not to use vlans.

Bug: 111320496
Test: Ran cf_x86_phone-userdebug with and without vlans enabled.
Change-Id: Ied74940d30848ac32abd73a349c46a9e8b619edb
Merged-In: Ied74940d30848ac32abd73a349c46a9e8b619edb
(cherry picked from commit 4c6a5bbf67f9eea7aecc6fefbec7e84821a7a0ec)
6 files changed