ANDROID: Fix cuttlefish redundant vsock connection.

I initially believed CONFIG_VHOST_VSOCK was necessary on the guest side,
but astrachan@ correctly pointed out that this was for setting up vsock
on a host system.

With both CONFIG_VHOST_VSOCK and the other vsock options enabled, vsock
fails on startup with the error:
vmw_vsock_virtio_transport: probe of virtio9 failed with error -16

This is probably from the guest-side and host-side vsock fighting over
ownership on the vsock device.

Bug: 121166534
Test: Ran cuttlefish with the android-4.4 kernel.
Change-Id: Ib23a5d756f02708984babc73e26fdbef8435bfb4
Signed-off-by: Cody Schuffelen <schuffelen@google.com>