[AVR] Add ICU test (RT-only)

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7052 35acf78f-673a-0410-8e92-d51de3d6d3f4
[AVR] Add GPT test (RT-only)

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7053 35acf78f-673a-0410-8e92-d51de3d6d3f4