rpc_binder: Create C/Rust bindings for inet socket

Add bindings for running a server/client over inet sockets to
libbinder_rpc_unstable and the librpcbinder Rust wrapper.

Bug: 267939632
Test: build and manual test
Change-Id: I5b38f6d071ed2fa667153f876681d30b3111450c
diff --git a/libs/binder/libbinder_rpc_unstable.map.txt b/libs/binder/libbinder_rpc_unstable.map.txt
index 1bc2416..63679c2 100644
--- a/libs/binder/libbinder_rpc_unstable.map.txt
+++ b/libs/binder/libbinder_rpc_unstable.map.txt
@@ -2,6 +2,7 @@
   global:
     ARpcServer_free;
     ARpcServer_join;
+    ARpcServer_newInet;
     ARpcServer_newInitUnixDomain;
     ARpcServer_newVsock;
     ARpcServer_shutdown;