Add binaries for adb over vsock.

Bug: 121166534
Change-Id: Id1c71c00b97fdc02291204bdea717b8a04eb2304
Test: adb bugreport on launch_cvd -kernel=...cf-4.14... -vsock_guest_cid=3 -adb_mode=vsock_tunnel
(cherry picked from commit 9e86ca19b293feb6fc15fcb1eab9a09f77ddc94f)
diff --git a/host_package.mk b/host_package.mk
index d744524..cb151cd 100644
--- a/host_package.mk
+++ b/host_package.mk
@@ -26,6 +26,7 @@
     host_region_e2e_test \
     launch_cvd \
     socket_forward_proxy \
+    socket_vsock_proxy \
     adb_connector \
     stop_cvd \
     stream_audio \