ANDROID: GKI: build in HVC_DRIVER

Cuttlefish and Goldfish both rely on the virtio console and
HVC_DRIVER is a binary config which is a dep for that driver.

Bug: 150620456
Test: Treehugger
Signed-off-by: Ram Muthiah <rammuthiah@google.com>
Change-Id: I54e7d95da4fcddd534d0f0f48b5c546cd2f2718d