vndk-def: Fix vndk-indirect computation bug

This commit replaces a vndk_indirect with vndk because we are computing
the indirect dependencies of vndk (i.e. closure(vndk) - vndk).

Bug: 37867089
Test: vndk-indirect libs are printed with sailfish images.
Merged-In: I218333c7dbb2a372cc9d170f34674510cc01aa0e
(cherry picked from commit 484219c3)

Change-Id: Ia0de1bf599e4be27a4324a09abf9653a5a50dea4