Initial RTC files.

git-svn-id: https://svn.code.sf.net/p/chibios/svn/trunk@6982 35acf78f-673a-0410-8e92-d51de3d6d3f4
Fixed bug #511.

git-svn-id: https://svn.code.sf.net/p/chibios/svn/trunk@6983 35acf78f-673a-0410-8e92-d51de3d6d3f4
Fixed the fix...

git-svn-id: https://svn.code.sf.net/p/chibios/svn/trunk@6985 35acf78f-673a-0410-8e92-d51de3d6d3f4