Add one visibility to libbz module

Added one visibility to the libbz module, to make it visible to moudles
in the vendor directory (which is needed to convert Make modules to
Soong in the vendor dir of the interal_master branch).

Bug: 205649904
Test: m libbz
Test: TreeHugger
Change-Id: Ia256108d21abdce5dda886ad8113c2d2bbfdac6f
1 file changed