Fix shared_libs for cc/prebuilt.go

This commit fixes `shared_libs` for `cc_prebuilt_binary`,
`cc_prebuilt_library_static`, and `cc_prebuilt_library_shared`.  Before
this commit, all shared libraries in `shared_libs` are dropped from the
generated `LOCAL_SHARED_LIBRARIES`.  This commit fixes the problem by
delegating `linkerDeps()` to `libraryDecorator.linkerDeps()`.

This commit also fixes the dependencies to NDK shared libraries.  Before
this change, those dependencies are mapped to a `ndkStubDepTag` and then
ignored by the computation of `AndroidMkSharedLibs`.  This commit adds
it back.

Bug: 123053270
Bug: 119084334
Test: libclang_rt.scudo-*.so can be checked with 2 more hacks.
Change-Id: I59e37e1a3fe0c329e8cb7032e5671f117f7832a0