Add libandroid_runtime_lazy

Extract lazy loading of libandroid_runtime from libbinder_ndk
into its own library.

This lib loads libandroid_runtime on demand, so the clients
which don't use this can benefit.

Do not over-use this lib to mock the build system and pretend not
depending on libandroid_runtime.

Bug: 125550121
Test: m -j
Test: readelf -d $OUT/system/lib64/libbinder_ndk.so | grep NEED
        # see if there is not libandroid_runtime
Test: atest android.binder.cts

Change-Id: I4b120686ba34f45e060594641ffc74bc1496c8c9