Ensure set_bitrate_mask compatibility across kernel versions

Resolve type mismatch error in vwifi_set_bitrate_mask for kernels < 5.19.2, where cfg80211_ops.
set_bitrate_mask lacks the link_id parameter, causing a build failure. Add conditional compilation
using LINUX_VERSION_CODE to define vwifi_set_bitrate_mask with or without link_id, ensuring compatibility
with kernels >= 5.19.2 and older.
Preserve all MCS and GI functionality.

Changes:
- Define vwifi_set_bitrate_mask with link_id for kernels >= 5.19.2 and without for older kernels.
- Update logging to include link_id only for newer kernels.
- Retain vwifi_vif fields (manual_mcs, manual_mcs_set, spatial_streams) and MCS logic
 (log all enabled MCSs, select highest, default to MCS 0).

Fixes: Type mismatch error for set_bitrate_mask on kernels < 5.19.2

Author: dingsen-Greenhorn

scripts/verify.sh

@@ -48,7 +48,7 @@ if [ $final_ret -eq 0 ]; then
     vw3_phy=$(get_wiphy_name vw3)
     vw4_phy=$(get_wiphy_name vw4)
     vw5_phy=$(get_wiphy_name vw5)
-    
+
     # create network namespaces for each phy (interface)
     sudo ip netns add ns0
     sudo ip netns add ns1
@@ -290,7 +290,7 @@ if [ $final_ret -eq 0 ]; then
     echo "================================================================================"
     sudo ip netns exec ns3 ping -c 1 10.0.0.6
 
-    # ping test: IBSS vw3 <--> IBSS vw4, should success
+    # ping test: IBSS vw3 <--> IBSS vw4, should succeed
     echo
     echo "================================================================================"
     echo "Ping Test: IBSS vw3 (10.0.0.4) (in ibss1) <--> IBSS vw4 (10.0.0.5) (in ibss1)"

vwifi.c

@@ -2397,7 +2397,9 @@ static int vwifi_leave_ibss(struct wiphy *wiphy, struct net_device *ndev)
  */
 static int vwifi_set_bitrate_mask(struct wiphy *wiphy,
                                   struct net_device *dev,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 2)
                                   unsigned int link_id,
+#endif
                                   const u8 *peer,
                                   const struct cfg80211_bitrate_mask *mask)
 {
@@ -2414,8 +2416,13 @@ static int vwifi_set_bitrate_mask(struct wiphy *wiphy,
         return -EINVAL;
     }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 2)
     pr_info("vwifi: set_bitrate_mask called for dev %s, link_id %u, peer %pM\n",
             dev->name, link_id, peer ? peer : vif->bssid);
+#else
+    pr_info("vwifi: set_bitrate_mask called for dev %s, peer %pM\n", dev->name,
+            peer ? peer : vif->bssid);
+#endif
     pr_info("vwifi: 2.4GHz MCS mask: %02x %02x %02x %02x\n",
             mask->control[NL80211_BAND_2GHZ].ht_mcs[0],
             mask->control[NL80211_BAND_2GHZ].ht_mcs[1],