STM32 DISCO : enable QSPI tests when available

Author: jeromecoutant

TESTS/mbed_hal/qspi/flash_configs/flash_configs.h

@@ -18,11 +18,21 @@
 #define MBED_FLASH_CONFIGS_H
 
 #if defined(TARGET_DISCO_L475VG_IOT01A)
-#include "STM/DISCO_L475VG_IOT01A/flash_config.h"
+#include "STM/DISCO_L475VG_IOT01A/flash_config.h" // MX25R6435F => MX25RXX35F_config.h
 #elif defined(TARGET_NRF52840)
 #include "NORDIC/NRF52840_DK/flash_config.h"
 #elif defined(TARGET_DISCO_F413ZH)
-#include "STM/DISCO_F413ZH/flash_config.h"
+#include "STM/DISCO_F413ZH/flash_config.h" // N25Q128A_config.h
+#elif defined(TARGET_DISCO_F746NG)
+#include "N25Q128A_config.h"
+#elif defined(TARGET_DISCO_F469NI)
+#include "N25Q128A_config.h"
+#elif defined(TARGET_DISCO_F769NI)
+#include "MX25RXX35F_config.h" // MX25L51245G
+#elif defined(TARGET_DISCO_L476VG)
+#include "N25Q128A_config.h"
+#elif defined(TARGET_DISCO_L496AG)
+#include "MX25RXX35F_config.h" // MX25R6435F
 #elif defined(TARGET_EFM32GG11_STK3701)
 #include "SiliconLabs/EFM32GG11_STK3701/flash_config.h"
 #elif defined(TARGET_K82F)