This associates the SHELL UART backend with the DTS uart0. It solves
an issue with unresponsive shell.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
GR716A microcontroller evaluation board with features an 80-pin
mezzanine connector. Also supports simulating with TSIM3.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>