Add targets for switching zygote runtime
Add targets for switching zygote runtime

"mm zygote-oat-process" will switch to art.
"mm zygote-app-process" will switch back to dalvik.

Change-Id: I32a6b5700f08a863a22db2b29876f31f4ab8d364

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst