Convert SparkFun_Artemis_Nano board over to new system.

Author: nigelb

boards/SparkFun_Artemis_Nano.json

@@ -3,9 +3,10 @@
     "cpu": "cortex-m4",
     "f_cpu": "48000000L",
     "mcu": "AMA3B1KK",
-    "variant": "redboard_artemis_nano",
-    "extra_flags": "-DARDUINO_AM_AP3_SFE_BB_ARTEMIS_NANO",
-    "linker_script": "artemis_sbl_svl_app.ld"
+    "variant": "TARGET_SFE_ARTEMIS_NANO",
+    "extra_flags": "-DARDUINO_APOLLO3_SFE_ARTEMIS_NANO ",
+    "linker_script": "0xC000.ld"
+
 
   },
   "frameworks": [