Create partition-specific symlink for jnilib install

Context
- Currently, unembedded JNI libraries are being installed from a symlink based on an android_app's partition.
- Unembedded JNI library may exist in a different partition from that of the app module, thus create a symlink based on the partition of each jni libraries.
- Scope of this change is limited to bp modules, and does not affect mk modules.

Implementation
- Use the JNI library name:partition mapping from LOCAL_SOONG_JNI_LIBS_PARTITION_<target> to create a symlink.

Bug: 154162945
Test: m
Change-Id: Ie9396e0eb1c5bfc5855a2a84db395a2b9008b17b