Update storage mbed_lib.json for MUSCA_A1_S

Author: Michael Schwarcz

features/storage/kvstore/conf/global/mbed_lib.json

@@ -34,6 +34,9 @@
         },
         "LPC55S69_S": {
             "storage_type": "TDB_INTERNAL"
+        },
+        "MUSCA_A1_S": {
+            "storage_type": "TDB_INTERNAL"
         }
     }
 }