Add memory configuration for LPC546XX

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>

features/FEATURE_LWIP/lwip-interface/mbed_lib.json

@@ -16,11 +16,11 @@
         "addr-timeout": {
             "help": "On dual-stack system how long to additionally wait for other stack's address in seconds",
             "value": 5
-        },        
+        },
         "addr-timeout-mode": {
             "help": "Address timeout mode; true: wait both stack's addresses; false: wait for preferred stack's address",
             "value": true
-        },        
+        },
         "ethernet-enabled": {
             "help": "Enable support for Ethernet interfaces",
             "value": true
@@ -106,6 +106,9 @@
         },
         "Freescale": {
             "mem-size": 36560
+        },
+        "NXP": {
+            "mem-size": 36496
         }
     }
 }