Replace llndk_library with llndk clause in cc_library

Remove the vestigial llndk_library and replace it with properties
in the llndk clause of the implementation cc_library.

Bug: 170784825
Test: m checkbuild
Test: compare out/soong/build.ninja
Change-Id: I960d7592fc71482e547f3617d0e55503c36cb63a