onclite: Add protobuf vendorcompat lib

Our blobs are compiled against libprotobuf-full-cpp.so, but
starting in R, Android is using a versioned naming approach,
e.g. libprotobuf-cpp-full-3.9.1.so.

See https://r.android.com/1109518

The entry in public.libraries.txt is needed to allow the
linker to find and use the lib outside the VNDK.

See https://source.android.com/devices/tech/config/namespaces_libraries



[wight554: added libprotobuf-cpp-lite as well]

Signed-off-by: Volodymyr Zhdanov <wight554@gmail.com>
Change-Id: Idf16c3b0368bb4974b62ca0e2f2c5b0ccd425447