[NETD-BPF#27] Require libnetd_updatable.so from APEX

Add libnetd_updatable.so as dependency of platform. The library will be
used by Netd. Linker config is required if a library in mainline module
is linked by platform.

Bug: 202086915
Test: m; flash; boot

Change-Id: I97183f022b229e788184a979d1a211968295563d
diff --git a/rootdir/etc/linker.config.json b/rootdir/etc/linker.config.json
index d62c41d..780ace5 100644
--- a/rootdir/etc/linker.config.json
+++ b/rootdir/etc/linker.config.json
@@ -20,6 +20,8 @@
     "libicuuc.so",
     // resolv
     "libnetd_resolv.so",
+    // netd
+    "libnetd_updatable.so",
     // nn
     "libneuralnetworks.so",
     // statsd