Drivers: hv: vmbus: Improve the CPU affiliation for channels

Drivers: hv: vmbus: Improve the CPU affiliation for channels

The current code tracks the assigned CPUs within a NUMA node in the context of
the primary channel. So, if we have a VM with a single NUMA node with 8 VCPUs, we may
end up unevenly distributing the channel load. Fix the issue by tracking affiliations
globally.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 9f01ec53458d9e9b68f1c555e773b5d1a1f66e94)

Orabug: 21886720
Signed-off-by: Jason Luo <zhangqing.luo@oracle.com>