Move threadnetwork HAL to VAPEX

com.android.hardware.threadnetwork is a new VAPEX containing
threadnetwork HAL. It also includes ot-rcp.

Bug: 296966113
Test: vts-tf > run vts -m VtsHalTheadNetworkTargetTest
Change-Id: Id2028d755f9b0dcc06ccd817bddf3195efb5595b
diff --git a/threadnetwork/aidl/default/threadnetwork-service-sim.rc b/threadnetwork/aidl/default/threadnetwork-service-sim.rc
new file mode 100644
index 0000000..3b889eb
--- /dev/null
+++ b/threadnetwork/aidl/default/threadnetwork-service-sim.rc
@@ -0,0 +1,3 @@
+service vendor.threadnetwork_hal /apex/com.android.hardware.threadnetwork/bin/hw/android.hardware.threadnetwork-service spinel+hdlc+forkpty:///apex/com.android.hardware.threadnetwork/bin/ot-rcp?forkpty-arg=1
+    class hal
+    user thread_network