mac80211: replace DEFINE_SIMPLE_ATTRIBUTE with DEFINE_DEBUGFS_ATTRIBUTE

Fix the following coccicheck warning:
./drivers/net/wireless/mac80211_hwsim.c:1040:0-23: WARNING:
hwsim_fops_rx_rssi should be defined with
DEFINE_DEBUGFS_ATTRIBUTE
Signed-off-by: Yihao Han <hanyihao@vivo.com>
Link: https://lore.kernel.org/r/20220218070228.6210-1-hanyihao@vivo.com
[fix indentation]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/mac80211_hwsim.c

@@ -1037,9 +1037,9 @@ static int hwsim_fops_rx_rssi_write(void *dat, u64 val)
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(hwsim_fops_rx_rssi,
-			hwsim_fops_rx_rssi_read, hwsim_fops_rx_rssi_write,
-			"%lld\n");
+DEFINE_DEBUGFS_ATTRIBUTE(hwsim_fops_rx_rssi,
+			 hwsim_fops_rx_rssi_read, hwsim_fops_rx_rssi_write,
+			 "%lld\n");
 
 static netdev_tx_t hwsim_mon_xmit(struct sk_buff *skb,
 					struct net_device *dev)