vdpa/mlx5: Fix clearing of VIRTIO_NET_F_MAC feature bit

stable inclusion
from stable-v5.16
commit ef76eb83
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5WXCZ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ef76eb83a17e803a66b64ac95b36ae48b3d17c22


----------------------------------------------------------------------

Cited patch in the fixes tag clears the features bit during reset.
mlx5 vdpa device feature bits are static decided by device capabilities.
These feature bits (including VIRTIO_NET_F_MAC) are initialized during
device addition time.

Clearing features bit in reset callback cleared the VIRTIO_NET_F_MAC. Due
to this, MAC address provided by the device is not honored.

Fix it by not clearing the static feature bits during reset.

Fixes: 0686082d ("vdpa: Add reset callback in vdpa_config_ops")
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20211026175519.87795-7-parav@nvidia.com


Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Pengyuan Zhao <zhaopengyuan@hisilicon.com>