M487: Enable FLASHIAP for custom targets

This is to support custom targets based on M480 series chips.

Author: ccli8

targets/targets.json

@@ -12823,6 +12823,9 @@
             "RESET_REASON",
             "USBDEVICE"
         ],
+        "components_add": [
+            "FLASHIAP"
+        ],
         "release_versions": [
             "5"
         ],
@@ -12836,9 +12839,6 @@
         "inherits": [
             "MCU_M480"
         ],
-        "components_add": [
-            "FLASHIAP"
-        ],
         "macros_add": [
             "MBEDTLS_CONFIG_HW_SUPPORT"
         ],
@@ -12855,9 +12855,6 @@
         "inherits": [
             "MCU_M480"
         ],
-        "components_add": [
-            "FLASHIAP"
-        ],
         "macros_add": [
             "MBEDTLS_CONFIG_HW_SUPPORT"
         ],