vdpa: introduce virtqueue groups

mainline inclusion
from mainline-v5.19-rc1
commit d4821902
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5WXCZ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d4821902e43453b85b31329441a9f6ac071228a8



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This patch introduces virtqueue groups to vDPA device. The virtqueue
group is the minimal set of virtqueues that must share an address
space. And the address space identifier could only be attached to
a specific virtqueue group.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Gautam Dawar <gdawar@xilinx.com>
Message-Id: <20220330180436.24644-6-gdawar@xilinx.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
[Changes to ifcvf and mlx5 are not included.]
Signed-off-by: Pengyuan Zhao <zhaopengyuan@hisilicon.com>