Merge pull request #11692 from VeijoPesonen/nrf52840_dk_enable_flashiap

NRF52840_DK: enables FLASHIAP for the device

Author: 0xc0170

targets/targets.json

@@ -7732,7 +7732,7 @@
     },
     "MCU_NRF52840": {
         "inherits": ["Target"],
-        "components_add": ["QSPIF"],
+        "components_add": ["QSPIF", "FLASHIAP"],
         "core": "Cortex-M4F",
         "macros": [
             "BOARD_PCA10056",