init.rc: Create a new group for dex2oat

Create a new group for dex2oat in cpu cgroup, which is dedicated for
dex2oat processes. Also modify task profiles for this change.

Bug: 201223712
Test: dex2oat group created
Change-Id: Ic61f4b8a64d01c03549b680970805e12b9ce4fcc
Merged-In: Ic61f4b8a64d01c03549b680970805e12b9ce4fcc
5 files changed