Switch SERCOM7 (Debug UART) to sync mode + add STDIO

this will allow us to do printf()

Change-Id: Ibf4ba961d4bbf8d787558f38f3d557422587aad3
21 files changed
tree: b1f79dce8ec44b78360316a51fe07e3519e9f5a8
  1. ccid/
  2. contrib/
  3. sysmoOCTSIM/