Add host_supported to VHAL libs.

We need to build a FakeVehicleHardware impl on host, thus we need
to add the host_supported option.

Test: Local build on host.
Bug: 328316981
Flag: EXEMPT hal change
Merged-In: Ia21d26640c465846423cab1a0ff8a283c798b92a
(cherry-picked from commit: 9d3513882ae42d50c7243e131916a03ef203840f)

Change-Id: Ia21d26640c465846423cab1a0ff8a283c798b92a
15 files changed