Use more shared libraries in adb and init.

fs_mgr is used by several different
processes in both system and recovery,
so it makes sense for it to be a shared
library to save space.

libadbd is used by adbd, recovery (as minadbd)
and fastbootd so it should be shared as well.

Bug: 78793464
Test: compiles
Change-Id: I4225f4d1a44e6e5811c68a55595d1f94f0773114
Merged-In: I4225f4d1a44e6e5811c68a55595d1f94f0773114
(cherry picked from commit aacfc68a)