The CPU has multiple issues and several parts of the platform code
does not even compile cleanly for this CPU in the current state.
This removes support for parts MK60DN256ZVLL10, MK60DN512ZVLL10
(note the Z) CPUs with this part number were used in Mulle v0.60 which
only has been used in some in-house projects at Eistec and LTU.
Fixes a problem with make buildtest if TARGET=mulle and no USB serial device connected:
$ make buildtest
Warning: no PORT set!
Building for Warning: .. failed
.../riot/Makefile.include:110: *** The specified board Warning: does not exist.. Stop.
.../riot/Makefile.include:110: *** The specified board Warning: does not exist.. Stop.
Building for no (no linking) .. failed
.../riot/Makefile.include:110: *** The specified board no does not exist.. Stop.
.../riot/Makefile.include:110: *** The specified board no does not exist.. Stop.
Building for PORT .. failed
.../riot/Makefile.include:110: *** The specified board PORT does not exist.. Stop.
.../riot/Makefile.include:110: *** The specified board PORT does not exist.. Stop.
Building for set! .. failed
.../riot/Makefile.include:110: *** The specified board set! does not exist.. Stop.
.../riot/Makefile.include:110: *** The specified board set! does not exist.. Stop.
Building for airfy-beacon (no linking) .. ^C
Initially supports only Mulles with serial number > 220 (due to missing
MK60DN256ZVLL10 support in k60).
See also: https://github.com/RIOT-OS/RIOT/wiki/Board%3A-Mulle
Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>