[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