ANDROID: sched/cpuset: Add vendor hook to change tasks affinity

Vendors might want to change tasks affinity settings when they are
moving from one cpuset into the other. Add vendor hook to give control
to vendor to implement what they need.

This feature is necessary to control hotplug behaviour within Qualcomm's
proprietary load tracking scheme, WALT.

This reverts commit 034ddf86 ("Revert "ANDROID: sched/cpuset: Add
vendor hook to change tasks affinity"") to effectively bring back the
original change.

Bug: 174125747
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
Signed-off-by: Sai Harshini Nimmala <quic_snimmala@quicinc.com>
Change-Id: Id4e9c3e47e3b4e041804bdf10cbd9e36179bc172