Build var to use vendor binder for trusty compile

Adding a trusty makefile build variable to select
which type of binder compile to use for trusty.
By default it will use vendor binder, but it can
be set to use system binder itself. This will be
use for trusty in system VMs.

Bug: 274779230
Test: manual tests using trusty VMs
Change-Id: Id8b6828867b0b4e8844d71e7e3ed4233c6b7afcd