arm: at91: dt: sam9g20ek: use rts/cts/dtr/dsr/dcd/ri pinctrl group for uart0

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>