set the default target and board to sam and adk2

Change-Id: I531d14a45a838eaf2ac8fc95c8087e9ad4397348
diff --git a/build/shared/lib/preferences.txt b/build/shared/lib/preferences.txt
index 16290aa..46392c3 100755
--- a/build/shared/lib/preferences.txt
+++ b/build/shared/lib/preferences.txt
@@ -243,11 +243,11 @@
 
 # ARDUINO PREFERENCES
 target_package = arduino
-target_platform = avr
-board = uno
+target_platform = sam
+board = adk2
 software=ARDUINO
 
-programmer = arduino:avrispmkii
+programmer = arduino:sambausb
 
 upload.using = bootloader
 upload.verify = true