mac80211: fix build error on kernel 6.6

mac80211: fix build error on kernel 6.6

The virtio_find_vqs() ABI has been changed since the 6.11 kernel.
Switch back to using the old ABI to fix the build error:

../mac80211-regular/backports-6.11/drivers/net/wireless/virtual/mac80211_hwsim.c: In function 'init_vqs':
../mac80211-regular/backports-6.11/drivers/net/wireless/virtual/mac80211_hwsim.c:6632:31: error: array type has incomplete element type 'struct virtqueue_info'
 6632 |         struct virtqueue_info vqs_info[HWSIM_NUM_VQS] = {
      |                               ^~~~~~~~
../mac80211-regular/backports-6.11/drivers/net/wireless/virtual/mac80211_hwsim.c:6637:16: error: too few arguments to function 'virtio_find_vqs'
 6637 |         return virtio_find_vqs(vdev, HWSIM_NUM_VQS,
      |                ^~~~~~~~~~~~~~~
In file included from ../mac80211-regular/backports-6.11/drivers/net/wireless/virtual/mac80211_hwsim.c:38:
./include/linux/virtio_config.h:224:5: note: declared here
  224 | int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
      |     ^~~~~~~~~~~~~~~
../mac80211-regular/backports-6.11/drivers/net/wireless/virtual/mac80211_hwsim.c:6632:31: error: unused variable 'vqs_info' [-Werror=unused-variable]
 6632 |         struct virtqueue_info vqs_info[HWSIM_NUM_VQS] = {
      |                               ^~~~~~~~
../mac80211-regular/backports-6.11/drivers/net/wireless/virtual/mac80211_hwsim.c:6639:1: error: control reaches end of non-void function [-Werror=return-type]
 6639 | }
      | ^

Signed-off-by: Shiji Yang <yangshiji66@qq.com>