SWD / ITM Pin Definitions Added

We've added default SWO / ITM pin definitions on all supported boards. ITM will default to 2M baud when using am_bsp_itm_printf_enable() or am_bsp_debug_printf_enable() w/ g_ui32PrintInterface set to AM_BSP_PRINT_INFC_SWO

Note that the default debug interface is UART -- this is selected when calling am_bsp_debug_printf_enable() without explicitly setting g_ui32PrintInterface ahead of time.