drop no-longer-needed apex_available clause on libhardware

codec2/vndk referenced, but did not use, libhardware. Now that
the reference is cleaned, we don't need to to export to apex's.

Bug: 221444002
Test: build, boot
Change-Id: I43bff5cab71d53d8c7422c13265f129b26ca0430
1 file changed