[asan] Re-enable zero_page_pc test on Android.

It's not failing anymore. Not sure what has changed (the bot was down for a
long time), but lets keep it this way.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222236 91177308-0d34-0410-b5e6-96231b3b80d8