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

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;
     }
 
-    pr_info("vwifi: set_bitrate_mask called for dev %s, link_id %u, peer %pM\n",
-            dev->name, link_id, peer ? peer : vif->bssid);
+    #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,
+                link_id, 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],