net: l2: wifi: Fix roaming fail issue

The NET_EVENT_WIFI_SIGNAL_CHANGE was not added to net mgmt event queue
so that no scan was triggered, which caused roaming fail. The event
NET_EVENT_WIFI_SIGNAL_CHANGE was dropped because it was not enabled in
WIFI_SHELL_MGMT_EVENTS. After adding NET_EVENT_WIFI_SIGNAL_CHANGE, the
roaming works as expected.
Same issue found on event NET_EVENT_WIFI_NEIGHBOR_REP_COMP for 11k
roaming. Add this event to WIFI_SHELL_MGMT_EVENTS, too.

Signed-off-by: Hui Bai <hui.bai@nxp.com>

Author: nxf58150

subsys/net/l2/wifi/wifi_shell.c

@@ -101,7 +101,9 @@ static const char server_key_test[] = {
 				NET_EVENT_WIFI_AP_ENABLE_RESULT   |\
 				NET_EVENT_WIFI_AP_DISABLE_RESULT  |\
 				NET_EVENT_WIFI_AP_STA_CONNECTED   |\
-				NET_EVENT_WIFI_AP_STA_DISCONNECTED)
+				NET_EVENT_WIFI_AP_STA_DISCONNECTED|\
+				NET_EVENT_WIFI_SIGNAL_CHANGE      |\
+				NET_EVENT_WIFI_NEIGHBOR_REP_COMP)
 
 #ifdef CONFIG_WIFI_MGMT_RAW_SCAN_RESULTS_ONLY
 #define WIFI_SHELL_SCAN_EVENTS (                   \