EDBG USART Initialization

In this application SERCOM4 is connected to the EDBG USART lines through which the SAML22 Xplained pro will communicate with the PC terminal application. configure_console() function initializes the SERCOM USART module connected to the EDBG USART, configures the corresponding USART pins and the studio serial initializations for the standard library APIs (like scanf, printf, etc,.)