Update standard driver configs for AVR demos

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@5896 35acf78f-673a-0410-8e92-d51de3d6d3f4
Fix style and license for AVR ADC driver

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@5897 35acf78f-673a-0410-8e92-d51de3d6d3f4