Retire libqemu_pipe from libreference-ril

libqemu_pipe will be retired since goldfish
is migrating to virtio-vsock.

Bug: 169261468
Test: presubmit
Signed-off-by: Roman Kiryanov <rkir@google.com>
Change-Id: I4147866d7a7cdc5bddfc47266b05ba68af303a9d
5 files changed