Adjust call to build-aml-prebuilts.sh.

It no longer sets variables specific for module building.

Cherry-picked from https://r.android.com/1729792.

Test: See https://r.android.com/1729335
Bug: 190194345
Bug: 174315599
Change-Id: I81fdf11da2dc22a4313cb4e068b63090ac98a2a7
Merged-In: I81fdf11da2dc22a4313cb4e068b63090ac98a2a7
1 file changed