Add license visibility to prebuilt vsdk

libbpf_minimal can be included as a prebuilt vsdk library. This must
include the license_kinds of libbpf_minimal-license from soong.
Add the visibility for the prebuilts.

Bug: 271539873
Test: build against vsdk
Change-Id: Ib1c3e7705e7f234b2b54c2180642d6134c6131ea