soc: microchip: mec: Add Kconfig for Segger RTT debug support

All parts in the Microchip MEC family support ARM JTAG/SWD/SWO.
We add Kconfig logic to allow building projects with Segger's
RTT debug for Cortex-M.

Signed-off-by: Scott Worley <scott.worley@microchip.com>