wlan: Fixed broken FTM mode for dynamically linked driver

DLKM driver won't go into FTM mode because it is not taking the value of
module parameter 'con_mode' at load time

Change-Id: Ie12e8aea2f68801e490aaad08cd46e4f68589306
CR-Fixed: 406448, 409334
diff --git a/CORE/HDD/src/wlan_hdd_main.c b/CORE/HDD/src/wlan_hdd_main.c
index 3b8ab3e..82385df 100644
--- a/CORE/HDD/src/wlan_hdd_main.c
+++ b/CORE/HDD/src/wlan_hdd_main.c
@@ -4320,7 +4320,7 @@
 static int con_mode_handler(const char *kmessage,
                                  struct kernel_param *kp)
 {
-   return 0;
+   return param_set_int(kmessage, kp);
 }
 #else /* #ifdef MODULE */
 /**---------------------------------------------------------------------------