set spi clock frequency for every submit. var spi_rate for plugins var sd_rate for µSD card git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda/arm@5355 bc5caf13-1734-44f8-af43-603852e9ee25
git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda/arm@4687 bc5caf13-1734-44f8-af43-603852e9ee25