ARM: dts: at91: sama7g5ek: enable pull-up on flexcom3 console lines

Flexcom3 is used as board console serial. There are no pull-ups on these
lines on the board. This means that if a cable is not connected (that has
pull-ups included), stray characters could appear on the console as the
floating pins voltage levels are interpreted as incoming characters.
To avoid this problem, enable the internal pull-ups on these lines.

Fixes: 7540629e ("ARM: dts: at91: add sama7g5 SoC DT and sama7g5-ek")
Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20220307113827.2419331-1-eugen.hristev@microchip.com

arch/arm/boot/dts/at91-sama7g5ek.dts

@@ -495,7 +495,7 @@ pinctrl_flx0_default: flx0_default {
 	pinctrl_flx3_default: flx3_default {
 		pinmux = <PIN_PD16__FLEXCOM3_IO0>,
 			 <PIN_PD17__FLEXCOM3_IO1>;
-		bias-disable;
+		bias-pull-up;
 	};
 
 	pinctrl_flx4_default: flx4_default {