vndk-def: Fix generalized VNDK-SP computation

This commit fixes some leftovers in the previous commit:

1. tagged_paths should be passed to ELFLinker.create().

2. vndk_sp_indirect_unused should not include the degenerated VNDK-SP.

Test: Run `vndk_definition_tool.py vndk` on a device.  With the latest
eligible-list-*-release.csv, SP-HAL errors should disappear.

Change-Id: I4135ff1cac48cca526d28a771c0ee414282cc2d5