Add memory bank config

Author: multiplemonomials

targets/targets.json5

@@ -3707,10 +3707,13 @@
     "ARDUINO_GIGA_CM7": {
         inherits: ["ARDUINO_GIGA"],
         "core": "Cortex-M7FD",
-        "mbed_rom_start": "0x08000000",
-        "mbed_rom_size" : "0x100000",
-        "mbed_ram_start": "0x24000000",
-        "mbed_ram_size" : "0x80000",
+        "memory_bank_config": {
+            // Select flash bank 1
+            "IROM1": {
+                "start": 0x08000000,
+                "size": 0x100000
+            }
+        },
         "extra_labels_add": [
             "STM32H747xI_CM7"
         ],