Pass list of module libraries to gen_ndk_backed_by_apex.sh

Running find on the entire module directory can lead to flaky failures
when a directory is modified by another rule while find is traversing
it.  Pass a list of libraries in the module into the script instead
of finding them on disk.

Fixes: 178509901
Test: TARGET_BUILD_APPS=com.android.runtime dist
Change-Id: Ie4bf288f0e3d99cbbed5ca8770687a9bbe5377e4