FastModel: change FVP_MPS2_M3 to FVP_MPS2 enable the MPS2 Family

Author: Qinghao Shi

components/storage/blockdevice/COMPONENT_FLASHIAP/mbed_lib.json

@@ -15,7 +15,7 @@
             "base-address": "0x1C0000",
             "size": "0x40000"
         },
-        "FVP_MPS2_M3": {
+        "FVP_MPS2": {
             "base-address": "0x00200000",
             "size": "0x200000"
         }