Reland "Add libdl_android as a bootstrap library".

Necessary after moving it into the Runtime APEX, as several framework
libraries loaded during early boot depends on it, e.g. libvndksupport.so,
libvulkan.so, and libgraphicsenv.so.

Test: build & boot
Bug: 135753770
Bug: 144343305
Change-Id: Ia95349e377605d709fae74d966bd4f2324eaf604