This creates a dependency edge between the ndk_library and its headers,
which should be a no-op in regular Soong builds. This dependency edge
will be used in the Multi-tree project to export the relevant .h files into a well
known location
The headers are in a different git project (frameworks/native)
Test: m nothing
Bug: 239044713
Change-Id: Ifd00d8d4d3771b2dbd924cea4f2ade0bafc15ed6