platformio.ini DUE native port support

platformio.ini

 #  - RAMPS4DUE
 #  - RADDS
 #
-[env:DUE]
+[env:DUE native port]
+platform    = atmelsam
+framework   = arduino
+board       = dueUSB
+build_flags = ${common.build_flags}
+lib_deps    = ${common.lib_deps}
+lib_ignore  = c1921b4
+src_filter  = ${common.default_src_filter}
+[env:DUE programming port]
 platform    = atmelsam
 framework   = arduino
 board       = due