Manually re-combine NUMAKER_PFM_M2351 memories

Author: theotherjimmy

tools/arm_pack_manager/index.json

@@ -163857,24 +163857,9 @@
                     "write": false
                 }, 
                 "default": true, 
-                "size": 262144, 
+                "size": 524288, 
                 "start": 0, 
                 "startup": true
-            }, 
-            "IROM2": {
-                "access": {
-                    "execute": true, 
-                    "non_secure": false, 
-                    "non_secure_callable": false, 
-                    "peripheral": false, 
-                    "read": true, 
-                    "secure": false, 
-                    "write": false
-                }, 
-                "default": false, 
-                "size": 262144, 
-                "start": 268697600, 
-                "startup": false
             }
         }, 
         "name": "M2351KIAAEES", 
@@ -462189,4 +462174,4 @@
         "vendor": "Nordic Semiconductor:54"
     }, 
     "version": "0.2.0"
-}
+}