Remove apex_available whitelist for the ART APEX

The marked library(ies) were available to the APEX via the
hand-written whitelist in build/soong/apex/apex.go. Trying to remove the
whitelist by adding apex_available property to the Android.bp of the
libraries.

Bug: 150999716
Test: m
Change-Id: I2b792657b444f0c963e1e92b7c91f6a0cfe1688c