UPSTREAM: mac80211_hwsim: use GFP_ATOMIC under spin lock

A spin lock is taken here so we should use GFP_ATOMIC.

Bug: 254441685
Fixes: 5d44fe7c9808 ("mac80211_hwsim: add frame transmission support over virtio")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20200422020154.112088-1-weiyongjun1@huawei.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit 0379861217dc2dd46e3bc517010060065b0dd6fc)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I60bb1e94123f511827c53cbe3f3706c005652758