ANDROID: GKI: cpuset: add field for task affinity for cpusets

This updates the struct task_struct ABI to include a field for vendors
to support task affinity for cpusets.

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Bug: 148872640
Bug: 149816871
Change-Id: I6c2ec1d5e3d994e176926d94b9e0cc92418020cc
Signed-off-by: Will McVicker <willmcvicker@google.com>
(cherry picked from commit b4fee475)
[only cherry-picked the ABI difference]