Add apex stub lib to LOCAL_SHARED_LIBRARIES

This commit removes a break statement so that apex stub libraries are
added to LOCAL_SHARED_LIBRARIES for prebuilt ABI checker.

This CL doesn't change I09b78e38df285033ef6e9c85f7ea4b0274e85070 [1].
The libraries provided by apex modules are not installed to
`/system/lib[64]` because their stub libraries have
`LOCAL_UNINSTALLABLE_MODULE := true`.

[1] https://android-review.googlesource.com/844555

Bug: 120266448
Bug: 119084334
Test: Add `stubs: { symbol_file: "libnetd_resolv.map.txt", versions: ["1"]}`
      to libnetd_resolv, create a program that depends on
      `libnetd_resolve`, build the program, and do not find
      `/system/lib/libnetd_resolv.so`.
Change-Id: Iffa2c1a0eac9c4940ec1fa05fbacb9806272c31e