Merge pull request #6088 from pilotak/master

STM32F429ZI add SERIAL_ASYNCH

Author: cmonr

targets/targets.json

@@ -1194,7 +1194,7 @@
         },
         "extra_labels_add": ["STM32F4", "STM32F429", "STM32F429ZI", "STM32F429xx", "STM32F429xI"],
         "macros_add": ["USB_STM_HAL", "USBHOST_OTHER"],
-        "device_has_add": ["ANALOGOUT", "CAN", "LOWPOWERTIMER", "SERIAL_FC", "TRNG", "FLASH"],
+        "device_has_add": ["ANALOGOUT", "CAN", "LOWPOWERTIMER", "SERIAL_ASYNCH", "SERIAL_FC", "TRNG", "FLASH"],
         "detect_code": ["0796"],
         "features": ["LWIP"],
         "release_versions": ["2", "5"],