modules: hostap: Fix DPP security mode show issue

[Description]
After DUT connects to AP through DPP,
enter 'wifi status' to check connection status.
Security shows UNKNOWN.

[Analysis]
1. DUT supplicant will add a dpp network after
   receiving GAS response.
   Assign ssid->key_mgmt as WPA_KEY_MGMT_DPP.
2. Call wpas_key_mgmt_to_zephyr() to convert
   hostapd/supplicant security type to zephry
   security type.
   In this function, convert WPA_KEY_MGMT_DPP
   to WIFI_SECURITY_TYPE_UNKNOWN.

[Fix]
1. Add code to convert WPA_KEY_MGMT_DPP
   to WIFI_SECURITY_TYPE_DPP.

Signed-off-by: Qiankun Li <qiankun.li@nxp.com>

Author: Liam-qk

modules/hostap/src/supp_api.c

@@ -415,6 +415,8 @@ enum wifi_security_type wpas_key_mgmt_to_zephyr(bool is_hapd, void *config, int
 		return WIFI_SECURITY_TYPE_FT_SAE;
 	case WPA_KEY_MGMT_FT_IEEE8021X:
 		return WIFI_SECURITY_TYPE_FT_EAP;
+	case WPA_KEY_MGMT_DPP:
+		return WIFI_SECURITY_TYPE_DPP;
 	case WPA_KEY_MGMT_FT_IEEE8021X_SHA384:
 		return WIFI_SECURITY_TYPE_FT_EAP_SHA384;
 	case WPA_KEY_MGMT_SAE_EXT_KEY: