Add v81 API

Ensure dexopt on Marshmallow

This is a follow-up on 01c3244. The
same issues occur also on Marshmallow. It seems that they usually don't
show up because adjustCpuAbisForSharedUserLPw already compiles the
providers. Especially LG's providers don't seem to be processed there
and therefore cause bootloops.

Fixes rovo89/Xposed#100.